1. Qualifiers: prepositional phrases

1.1. Building Precise Noun Groups

In scientific writing, we must be extremely specific about which thing we are describing and what exactly it refers to.
We achieve this by expanding the noun group.
One key way to do this is by adding a Qualifier.
A Qualifier is a group of words that comes after the noun and gives extra information to define it more precisely.

It helps answer questions like:

  • which one?

  • what type?

  • in what situation?

Qualifiers are often prepositional phrases (e.g. in the beaker, at high temperature, of the solution), but can also take other forms.

Note

A prepositional phrase can function in two different ways:

  • as a Qualifier → it describes a noun (e.g. the water in the beaker)

  • as a Circumstance → it describes a process (e.g. the water was heated in the beaker)

1.2. Exmples of Prepositional phrases functioning as Qualifiers

  • Place (Location): Pinpoints exactly where the object is.

    • The chloroplasts in the plant cell are green.

    • The valves between the heart chambers prevent backflow.

  • Time (Sequence): Specifies when an event occurs in relation to other steps in the process.

    • The colour change after five minutes was recorded carefully.

    • The reaction before the addition of acid remained stable.

  • Time (Duration): Specifies how long a process or state lasts.

    • The fossilisation over millions of years preserved the skeletal structure.

    • The incubation for seventy-two hours allowed the cultures to develop.

  • Manner (Method/Means): Explains the tools or specific processes used to achieve a result.

    • The bonding through electron sharing results in a covalent structure.

    • The separation by filtration effectively removed the insoluble solids.

  • Manner (Quality/State): Describes the specific physical state or the way something behaves.

    • The movement with a constant speed was plotted on the distance-time graph.

    • The gas under high pressure expanded rapidly when the valve was opened.

1.3. Matching Qualifiers to the head noun

Matching Qualifiers — Biology and Physics

Match the correct Qualifier (post-modifier) to the core Thing.

Options: (A) with a constant speed, (B) in the plant cell, (C) through the wire, (D) under the microscope, (E) between the joints

No.

Core Noun (Thing)

Thing + Qualifier

1.1

chloroplasts

chloroplasts [_______________________]

1.2

specimen

specimen [_______________________]

1.3

friction

friction [_______________________]

1.4

current

current [_______________________]

1.5

motion

motion [_______________________]
Reveal Answer Key
Answers:
1.1 (B) chloroplasts in the plant cell;
1.2 (D) specimen under the microscope;
1.3 (E) friction between the joints;
1.4 (C) current through the wire;
1.5 (A) motion with a constant speed.

Matching Qualifiers — Chemistry and Earth Science

Match the correct Qualifier (post-modifier) to the core Thing.

Options: (A) over millions of years, (B) after heating, (C) in the test tube, (D) during the reaction, (E) from the bunsen burner

No.

Core Noun (Thing)

Thing + Qualifier

2.1

bubbles

bubbles [_______________________]

2.2

residue

residue [_______________________]

2.3

heat

heat [_______________________]

2.4

fossilisation

fossilisation [_______________________]

2.5

colour change

colour change [_______________________]
Reveal Answer Key
Answers:
2.1 (D) bubbles during the reaction;
2.2 (C) residue in the test tube;
2.3 (E) heat from the bunsen burner;
2.4 (A) fossilisation over millions of years;
2.5 (B) colour change after heating.

1.4. Common prepositions of Place / Position

These are the most common prepositions used in noun group qualifiers.
Each sentence shows a prepositional phrase functioning as a qualifier in a noun group.
The prepositional phrase is outlined.

Category

Preposition

Example sentence

Place / Position

in

The water in the beaker was heated gradually.

Place / Position

on

The bacteria on the agar plate grew rapidly.

Place / Position

at

The reaction at the metal surface was observed closely.

Place / Position

under

The plant under the lamp grew significantly faster.

Place / Position

above

The cloud above the mountain slowly released moisture.

Place / Position

below

The temperature below zero instantly caused freezing.

Place / Position

over

The layer over the liquid effectively prevented evaporation.

Place / Position

between

The distance between the markers was measured precisely.

Place / Position

near

The plants near the window grew noticeably faster.

Place / Position

beside

The beaker beside the burner slowly warmed the salt water.

Place / Position

next to

The thermometer next to the flask accurately recorded the temperature.

Place / Position

behind

The equipment behind the screen was adequately protected.

Place / Position

in front of

The sample in front of the sensor was analysed automatically.

Place / Position

inside

The gas inside the test tube expanded uniformly.

Place / Position

outside

The air outside the container cooled rapidly.

Place / Position

around

The field lines around the magnet were clearly visible.

Expansion of noun groups by prepositions of Place / Position

Write three sentences of your choice, each one adding a prepositional phrase to its noun group.

→ Expand the noun group, the water, by adding a prepositional phrase as a place qualifier using “in”.
The water was heated gently.
→ Expand the noun group, the bacteria, by adding a prepositional phrase as a place qualifier using “on / in / near”.
The bacteria grew rapidly.
→ Expand the noun group, the plant, by adding a prepositional phrase as a place qualifier using “under / near / beside”.
The plant grew faster.
→ Expand the noun group, the beaker, by adding a prepositional phrase as a place qualifier using “beside / next to / on”.
The beaker contained salt water.
→ Expand the noun group, the field lines, by adding a prepositional phrase as a place qualifier using “around / between/ above”.
The field lines were mapped using iron filings.
Reveal Suggested Answers
The water in the beaker was heated gently.
The water in the container was heated gently.
The water in the flask was heated gently.
The bacteria on the agar plate grew rapidly.
The bacteria in the culture dish grew rapidly.
The bacteria near the edge of agar plate grew rapidly.
The plant under the lamp grew faster.
The plant near the window grew faster.
The plant beside the window grew faster.
The beaker beside the burner contained salt water.
The beaker next to the flask contained salt water.
The beaker on the bench contained salt water.
The field lines around the magnet were mapped using iron filings.
The field lines between the coils were mapped using iron filings.
The field lines above the magnet were mapped using iron filings.

1.5. Common prepositions of Movement / Direction

These are common prepositions of movement / direction in noun group qualifiers.
Each sentence shows a prepositional phrase functioning as a qualifier in a noun group.
The prepositional phrase is outlined.

Category

Preposition

Example sentence (noun group marked)

Movement / Direction

from

The distance from the start line was measured precisely with a laser rangefinder.

Movement / Direction

through

The current through the wire increased rapidly once the voltage was adjusted.

Movement / Direction

across

The force across the surface was distributed evenly to prevent the material from fracturing.

Movement / Direction

along

The wave along the rope transferred energy efficiently toward the fixed end.

Expansion of noun groups by prepositions of Movement / Direction

Write three sentences of your choice, each one adding a prepositional phrase to its noun group.

→ Expand the noun group, the distance, by adding a prepositional phrase as a movement/direction qualifier using “from”.
The distance was measured precisely with a laser rangefinder.
→ Expand the noun group, the current, by adding a prepositional phrase as a movement/direction qualifier using “through”.
The current increased rapidly once the voltage was increased.
Reveal Suggested Answers
The distance from the start line was measured precisely with a laser rangefinder.
The distance from the retort stand was measured precisely with a laser rangefinder.
The distance from the bench was measured precisely with a laser rangefinder.
The current through the wire increased rapidly once the voltage was increased.
The current through the circuit increased rapidly once the voltage was increased.
The current through the conductor increased rapidly once the voltage was increased.

1.6. Common prepositions of Possession / Relation

These are common prepositions of possession / relation in noun group qualifiers.
Each sentence shows a prepositional phrase functioning as a qualifier in a noun group.
The prepositional phrase is outlined.

Category

Preposition

Example sentence (noun group marked)

Possession / Relation

of

The colour of the solution changed instantly from clear to a deep violet.

Possession / Relation

belonging to

The sample belonging to trial A reacted faster than the specimens in the control group.

Expansion of noun groups by prepositions of Possession / Relation

Write three sentences of your choice, each one adding a prepositional phrase to its noun group.

→ Expand the noun group by adding a prepositional phrase as a possession/relation qualifier using “belonging to”.
The sample reacted faster than the others in the experiment.
→ Expand the noun group, by adding a prepositional phrase as a possession/relation qualifier using “of”.
The colour changed instantly from pink to a deep violet.
Reveal Suggested Answers
The sample belonging to trial A reacted faster than the others in the experiment.
The sample belonging to the heated group reacted faster than the others in the experiment.
The sample belonging to the control group reacted faster than the others in the experiment.
The colour of the solution changed instantly from pink to a deep violet.
The colour of the indicator changed instantly from pink to a deep violet.
The colour of the solid changed instantly from pink to a deep violet.

1.7. Common prepositions of Topic / Reference

These are common prepositions of topic / reference in noun group qualifiers.
Each sentence shows a prepositional phrase functioning as a qualifier in a noun group.
The prepositional phrase is outlined.

Category

Preposition

Example sentence (noun group marked)

Topic / Reference

from

The data from the reaction was recorded automatically by the digital sensors.

Topic / Reference

concerning

The report concerning heat transfer was submitted for review after the final trial.

Topic / Reference

in relation to

The change in relation to temperature was measured carefully using a high-precision probe.

Topic / Reference

with respect to

The trend with respect to time was plotted on a scatter graph to show the rate of change.

Expansion of noun groups by prepositions of Topic / Reference

Write three sentences of your choice, each one adding a prepositional phrase to its noun group.

→ Expand the noun group, the measurements, by adding a prepositional phrase as a movement/direction qualifier using “from”.
The measurements were carefully recorded.
→ Expand the noun group, the report, by adding a prepositional phrase as a topic/reference qualifier using “concerning”.
The report was formally submitted.
→ Expand the noun group, the trend, by adding a prepositional phrase as a topic/reference qualifier using “with respect to”.
The trend was clearly plotted.
Reveal Suggested Answers
The measurements from the photosynthesis experiment were carefully recorded.
The measurements from the motion investigation were carefully recorded.
The measurements from the titration experiment were carefully recorded.
The report concerning heat transfer was formally submitted.
The report concerning signs of a chemical reaction was formally submitted.
The report concerning crystal sizes in metamorphic rocks was formally submitted.
The trend with respect to time was clearly plotted.
The trend with respect to temperature was clearly plotted.
The trend with respect to the variable was clearly plotted.

1.8. Common prepositions of Addition / Exception

These are common prepositions of addition / exception in noun group qualifiers.
Each sentence shows a prepositional phrase functioning as a qualifier in a noun group.
The prepositional phrase is outlined.

Category

Preposition

Example sentence (noun group marked)

Addition

in addition to

The results in addition to the measurements were analysed.

Addition

as well as

The gas as well as the liquid was observed.

Exception

except

The samples except the control reacted.

Exception

apart from

The results apart from trial 2 were consistent.

Expansion of noun groups by prepositions of Addition / Exception

Write three sentences of your choice, each one adding a prepositional phrase to its noun group.

→ Expand the noun group, the gas, by adding a prepositional phrase as an addition qualifier using “as well as”.
The gas was observed escaping through the valve.
→ Expand the noun group, the samples, by adding a prepositional phrase as an exception qualifier using “except”.
All the samples reacted immediately when the acid was added.
→ Expand the noun group, the results, by adding a prepositional phrase as an exception qualifier using “apart from”.
All of the results were consistent with the original hypothesis.
Reveal Suggested Answers
The gas as well as the liquid was observed escaping through the valve.
The gas as well as the residue was observed escaping through the valve.
The gas as well as the vapour was observed escaping through the valve.
All the samples except the control reacted immediately when the acid was added.
All the samples except the first trial reacted immediately when the acid was added.
All the samples except the pure water reacted immediately when the acid was added.
All of the results apart from trial 2 were consistent with the original hypothesis.
All of the results apart from the final reading were consistent with the original hypothesis.
All of the results apart from the outliers were consistent with the original hypothesis.

1.9. Mixed prepositional phrase qualifiers

Noun group expansion: mixed prepositional phrase qualifiers

Write three sentences of your choice, each one adding a prepositional phrase to its noun group.

→ Expand the noun group, the plant, by adding a prepositional phrase as a place qualifier using “in / on / under / near”.
The plant grew quickly.
→ Expand the noun group, the current, by adding a prepositional phrase as a movement/direction qualifier using “through / across / along”.
The current increased steadily.
→ Expand the noun group, the colour, by adding a prepositional phrase as a possession/relation qualifier using “of / belonging to”.
The colour changed suddenly.
→ Expand the noun group, the report, by adding a prepositional phrase as a topic/reference qualifier using “about / concerning”.
The report was submitted to the teacher.
→ Expand the noun group, the reaction, by adding a prepositional phrase as a time qualifier using “before / after / during”.
The reaction was observed carefully.
Reveal Suggested Answers
The plant in the greenhouse grew quickly.
The plant under the lamp grew quickly.
The plant near the window grew quickly.
The current through the wire increased steadily.
The current across the circuit increased steadily.
The current along the conductor increased steadily.
The colour of the solution changed suddenly.
The colour of the liquid changed suddenly.
The colour belonging to the mixture changed suddenly.
The report about the experiment was submitted to the teacher.
The report concerning heat transfer was submitted to the teacher.
The report about the investigation was submitted to the teacher.
The reaction during heating was observed carefully.
The reaction before mixing was observed carefully.
The reaction after adding the acid was observed carefully.