English verb conjugation COULD SING

Irregular verb: sing - sang - sung

Affirmation

Simple form

I could sing
you could sing
he could sing
we could sing
you could sing
they could sing

V-ing form

I could be singing
you could be singing
he could be singing
we could be singing
you could be singing
they could be singing

Perfect

I could have sung
you could have sung
he could have sung
we could have sung
you could have sung
they could have sung

V-ing perfect

I could have been singing
you could have been singing
he could have been singing
we could have been singing
you could have been singing
they could have been singing

Negation

Simple form

I could not sing
you could not sing
he could not sing
we could not sing
you could not sing
they could not sing

V-ing form

I could not be singing
you could not be singing
he could not be singing
we could not be singing
you could not be singing
they could not be singing

Perfect

I could not have sung
you could not have sung
he could not have sung
we could not have sung
you could not have sung
they could not have sung

V-ing perfect

I could not have been singing
you could not have been singing
he could not have been singing
we could not have been singing
you could not have been singing
they could not have been singing

Interrogative form

Simple form

could I sing?
could you sing?
could he sing?
could we sing?
could you sing?
could they sing?

V-ing form

could I be singing?
could you be singing?
could he be singing?
could we be singing?
could you be singing?
could they be singing?

Perfect

could I have sung?
could you have sung?
could he have sung?
could we have sung?
could you have sung?
could they have sung?

V-ing perfect

could I have been singing?
could you have been singing?
could he have been singing?
could we have been singing?
could you have been singing?
could they have been singing?

Interro-negative form

Simple form

could I not sing?
could you not sing?
could he not sing?
could we not sing?
could you not sing?
could they not sing?

V-ing form

could I not be singing?
could you not be singing?
could he not be singing?
could we not be singing?
could you not be singing?
could they not be singing?

Perfect

could I not have sung?
could you not have sung?
could he not have sung?
could we not have sung?
could you not have sung?
could they not have sung?

V-ing perfect

could I not have been singing?
could you not have been singing?
could he not have been singing?
could we not have been singing?
could you not have been singing?
could they not have been singing?

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