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 could not do
you could not do
he could not do
we could not do
you could not do
they could not do

V-ing form

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

Perfect

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

V-ing perfect

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

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

V-ing form

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

Perfect

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

V-ing perfect

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