English verb conjugation COULD DO

Irregular verb: do - did - done

Affirmation

Simple form

I could do
you could do
he could do
we could do
you could do
they could do

V-ing form

I could be doing
you could be doing
he could be doing
we could be doing
you could be doing
they could be doing

Perfect

I could have done
you could have done
he could have done
we could have done
you could have done
they could have done

V-ing perfect

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

Negation

Simple form

I couldn't do
you couldn't do
he couldn't do
we couldn't do
you couldn't do
they couldn't do

V-ing form

I couldn't be doing
you couldn't be doing
he couldn't be doing
we couldn't be doing
you couldn't be doing
they couldn't be doing

Perfect

I couldn't have done
you couldn't have done
he couldn't have done
we couldn't have done
you couldn't have done
they couldn't have done

V-ing perfect

I couldn't have been doing
you couldn't have been doing
he couldn't have been doing
we couldn't have been doing
you couldn't have been doing
they couldn't have been doing

Interrogative form

Simple form

could I do?
could you do?
could he do?
could we do?
could you do?
could they do?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

couldn't I do?
couldn't you do?
couldn't he do?
couldn't we do?
couldn't you do?
couldn't they do?

V-ing form

couldn't I be doing?
couldn't you be doing?
couldn't he be doing?
couldn't we be doing?
couldn't you be doing?
couldn't they be doing?

Perfect

couldn't I have done?
couldn't you have done?
couldn't he have done?
couldn't we have done?
couldn't you have done?
couldn't they have done?

V-ing perfect

couldn't I have been doing?
couldn't you have been doing?
couldn't he have been doing?
couldn't we have been doing?
couldn't you have been doing?
couldn't they have been doing?

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