Question

Rules for changing Tenses?

Answer 1

Tenses
present indefinite -subject+v1 + s/es +object
present continuous- subject + is /am/are +v1 + ing + object
present perfect -subject +has/have + v3 + object
present perfect continuous - subject + has /have been+ v1 + ing + since/for + object

Answer 2

Answer:

there are many rules of tense.

chart is attached