1. The voice of the verb is distinct from its tense. Don't confuse the passive voice with the past tense. (Sentence 2 happens to be in the past tense, but 3 is not; both 2 and 3 are in the passive ...

Use the passive voice when you don’t know who is doing an action, or to emphasise that an action is being done to something or someone, rather than focusing on who or what is doing the action.

In the methods section one would use past tense due to what they have done was in the past. It has been debated whether one should use active or passive voice. The scientific journal Nature states ...

This is the person or thing doing the verb. The passive voice is made with subject + to be + past participle + by + object. Note that the active voice object becomes the passive voice subject.

Use your current topic — that is, what you are writing about — as the grammatical subject of your sentence (see Verbs: Choosing between active and passive voice). When writing a complex ...

Theoretically, passive voice constructions can appear in any tense, but in actual practice with "progressive tense forms," they seem to be confined mostly to the present and past tenses. (Progressive ...

There is a small class of transitive verbs that cannot be marked in the passive voice. 4. The potato was eaten by John. 5. *Be flying some birds. 6. *Hank's father is resembled by Henry. In the ...