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 Here is your required definitions:

Verb: A word used to describe an action, state or occurrence or the sentence is known as a verb like hear.

Past tense: Any state or expression happened, but previously existed is known as past tense.

She was sad.

Present tense: Any tense that express any action that is currently going to perform or generally exists is known as present tense.

He is happy.

Future tense: Any tense that express an action that has not yet happened is known as future tense.

I will eat chips.