English verb conjugation COULD SING

Irregular verb: sing - sang - sung

Affirmation

Simple form

I could sing
you could sing
she could sing
we could sing
you could sing
they could sing

V-ing form

I could be singing
you could be singing
she could be singing
we could be singing
you could be singing
they could be singing

Perfect

I could have sung
you could have sung
she 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
she could have been singing
we could have been singing
you could have been singing
they could have been singing

Negation

Simple form

I couldn't sing
you couldn't sing
she couldn't sing
we couldn't sing
you couldn't sing
they couldn't sing

V-ing form

I couldn't be singing
you couldn't be singing
she couldn't be singing
we couldn't be singing
you couldn't be singing
they couldn't be singing

Perfect

I couldn't have sung
you couldn't have sung
she couldn't have sung
we couldn't have sung
you couldn't have sung
they couldn't have sung

V-ing perfect

I couldn't have been singing
you couldn't have been singing
she couldn't have been singing
we couldn't have been singing
you couldn't have been singing
they couldn't have been singing

Interrogative form

Simple form

could I sing?
could you sing?
could she sing?
could we sing?
could you sing?
could they sing?

V-ing form

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

Perfect

could I have sung?
could you have sung?
could she 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 she have been singing?
could we have been singing?
could you have been singing?
could they have been singing?

Interro-negative form

Simple form

couldn't I sing?
couldn't you sing?
couldn't she sing?
couldn't we sing?
couldn't you sing?
couldn't they sing?

V-ing form

couldn't I be singing?
couldn't you be singing?
couldn't she be singing?
couldn't we be singing?
couldn't you be singing?
couldn't they be singing?

Perfect

couldn't I have sung?
couldn't you have sung?
couldn't she have sung?
couldn't we have sung?
couldn't you have sung?
couldn't they have sung?

V-ing perfect

couldn't I have been singing?
couldn't you have been singing?
couldn't she have been singing?
couldn't we have been singing?
couldn't you have been singing?
couldn't they have been singing?

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