I am singing / I was singing
you are singing / you was singing
he/she/it is singing / he/she/it was singing
we are singing / we were singing
you are singing / you were singing
they are singing / they were singing
I am dancing / I was dancing
you are dancing / you was dancing
he/she/it is dancing / he/she.it was dancing
we are dancing / we were dancing
you are dancing /you were dancing
they are dancing / they were dancing
to be-was/were-been