For instance, the subject (person, thing, or idea) that the author wishes to discuss in a sentence should occur near the beginning in the topic position where the reader expects to find it ("first things first").The following active-voice sentence begins a new section in which the topic is "green plants" (the performer): Green plants produce carbohydrates in the presence of light and chlorophyll.
When discussing an experimental procedure in the Methods section, a researcher might write: The sentences could be converted to active voice by writing the following: We kept the honey bees in a humidified chamber at room temperature overnight. (In fact, the second sentence is one word longer than it is in the original version.
We heated the solution to 90°C for approximately 30 minutes and then allowed it to cool. The active voice is not automatically more concise than the passive.) Does the active voice add clarity?
In the first sentence, the author's attempts to name the performer would be awkward; in the second sentence, the author assumes the reader will not be interested in the name of the publisher; and in the third sentence, the performer (researchers) is obvious.
When naming the performer would prove difficult or unnecessary, the passive voice works well.
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