Often, in language use, deciding whether to use the present perfect or the past simple depends on your perspective ... so I choose to use the present perfect passive tense. Similarly, twenty ...

English speakers often use the past simple and past continuous together ... Some verbs are not normally used in the continuous tense. These are often verbs associated with thoughts and feelings ...

For example, the tense may change between the methods section and the discussion section. The abstract is usually in the past tense due to it showing what has already been studied. Example: “This ...