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Difficulty: EasyImperative Verb Forms and Direct Commands

You are listening to an audio recording of laboratory safety instructions delivered by a workshop supervisor:

"Always wear your protective goggles before handling the mixture. Do not touch the glassware with bare hands, and never heat the solution without opening the ventilation valve. Place the test tube in the central rack immediately after taking the measurement."

According to the supervisor's direct imperative commands, which of the following is an affirmative instruction to perform rather than a prohibited action?

  1. A
    Touching the glassware with unprotected hands
  2. B
    Heating the chemical solution while the ventilation valve remains closed
  3. Placing the test tube in the central rack following the measurementAnswer
  4. D
    Waiting until the end of the entire procedure to open the ventilation valve

Answer

Placing the test tube in the central rack following the measurement
The supervisor uses the affirmative imperative form 'Place' to direct listeners to position the test tube in the central rack after measuring. This is a direct, positive command telling the listener what action must be carried out.

Step-by-Step Solution

1
Analyze the spoken commands in the audio transcript
Identified two negative commands ('Do not touch', 'never heat without opening') and two affirmative commands ('Always wear', 'Place the test tube')
Differentiating between affirmative and negative imperative structures is essential for identifying required actions.
2
Evaluate the answer choices against the affirmative instructions
The action of placing the test tube in the central rack corresponds directly to the affirmative command 'Place the test tube in the central rack immediately after taking the measurement.'
Matching the explicit directive with the correct statement confirms the accurate affirmative command.

Key Concept

Distinguishing affirmative imperative commands from negative prohibitions in spoken instructions
Estimated Time:45s
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Topics

Imperative Verb Forms and Direct Commands

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