They are hungry. In English we have many different verb tenses, but the most common one you will use besides the present tense will be the past tense. Normally in the past tense, you do not need to ...

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There is a misconception that all verbs in a paragraph should be in the same tense. The choice of the appropriate verb tense depends on context and meaning.

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 ...