Question

To Sing .- present simple.
-present continous.
-present perfect simple.
-present perfect continous. 
Urgent, va rog.

Answer 1

Present simple
I sing
You sing
He/she sing
We sing
You sing
They sing

Present continous
I am singing
You are singing
He/she is singing
We are singing
You are singing
They are singing

P.P.S:
I have sung
You have sung
He/she has sung
We have sung
You have sung
They have sung

P.P.C
I have been singing
You have been singing
He/she has been singing
We have been singing
You have been singing
They have been singing