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What is the difference between active and passive sentences? “We mixed A and B” is an active sentence. “A and B were mixed together” is the passive version. Active sentences are more direct, shorter and clearer. Compare the following two versions of the same thought.

“The ability of the antibiotics to inhibit bacterial growth was examined by using standard techniques.” (15 words)

“We used standard techniques to examine the ability of antibiotics to inhibit bacterial growth.” (14 words)

The active sentence is much clearer. Here is another example, based on a sentence frequently found in scientific writing. Once again, the active version is preferable.

“The improved versions are presented in section x.” (8 words)

“Section x presents the improved versions.” (6 words)

Another motive for writing active sentences is that they are more natural. We do not speak in the passive. If you do not believe me, try explaining what you did today in the passive. “Coffee was drunk at breakfast. Afterwards, teeth were brushed.” Relating daily experiences in this way is not natural. Why then should we use the passive for scientific writing?

It is your decision whether you use more active sentences than passive ones. If you think you can transmit your thoughts better using passive sentences, then go ahead. Just remember though that good writing should sound as if you are speaking to someone.