The abstract is usually in the past tense due to it showing what has already been studied ... Passive voice also allows one to help move words to emphasize them. Passive voice can also be useful when ...

Readers are more familiar with this tense because they are used to being told a story that has already taken place. For most verbs you add an 'ed' at the end of the word to change it to the past ...

When two things occurred in the past, the past perfect tense comes in handy to express them within a clause. In other words, unlike the present perfect tense which states an action that started in ...

(Sentence 2 happens to be in the past tense, but 3 is not; both 2 and 3 are in the passive voice.) 2. The passive voice uses more words than the active voice. 3. A sentence with a verb in the passive ...