what is indefinite tense
Here is a simpler explanation of the present indefinite tense or the simple present tense:
Some actions or events occur for which we cannot point our the exact point of time except that they occur in the present moment. To express such situations we use a particular form of the present tense called the present indefinite tense or simple present tense. For example: I go, I eat, I sleep, The Sun rises in the east, etc.
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).