Explain simple tense, continuous tense and perfect tense

Answer: (

Simple) Present Indefinite Tense:

I eat mangoes often.

The Sun rises in the East.

(To describe regular, habitual, routine actions, and universal or scientific truths.)

Present Continuous Tense:

I am eating mangoes now.

(To describe an action which is going on at the time of speaking.)

Present Perfect Tense:

I have eaten a mango just now.

(To describe an action which has just now or recently been completed, and which has a connection with, or impact on, the present time or place.)