A verb's tense tells us when an action happens: past, present or future. Each time also has simple (the plain action), progressive (an action in progress, with -ing), and perfect (a completed action, with has/have/had) forms. You also need to keep the tense consistent within a sentence. Learn each below.
Tense tells us when the action happens.
The simple form just states the action, with no helper verb.
Made with am/is/are/was/were + -ing. It shows an action going on at the time.
Made with has/have/had + the past form. It links a finished action to now (or to another time).
Don't switch tense in the middle of a sentence without a reason.
If one verb is in the past, the others usually should be too.
Read the question, then the answer with the rule that solves it.