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The indefinite (or simple) tenses are used to describe actions but do not state whether the action is complete or on-going.
In the past: I went / they ate / she felt
(the simple past tense)
In the present: I go / we clean / it recovers
(the simple present tense)
In the future: I will go / you will act / he will fly
(the simple future tense)
Verbs can be categorised by aspect. These are said to be in the "indefinite aspect" (also called the "simple aspect").