TENSE TYPE is a grammatical term used to describe the form of a verb that indicates when an action took place. The most common tense type is the PAST tense, which is used to indicate that an action has already happened. The PAST tense is usually indicated by adding '-ed' to the end of a verb, such as 'walked' or 'jumped'. Other tense types include the present tense, which is used to indicate that an action is happening now, and the future tense, which is used to indicate that an action will happen in the future.