Turn to the front of a physical dictionary or look under the “Help” section of an online dictionary, and you’ll find ...

A regular verb is one that conforms to the rules of grammar, whereas an irregular verb is one that does not ... but the most common one you will use besides the present tense will be the past tense.

One’s tense will vary depending on what one is trying to convey within their paper or section of their paper. For example, the tense may change between the methods section and the discussion section.