English verb conjugation COULD DO

Irregular verb: do - did - done

Affirmation

Simple form

I could do
you could do
she could do
we could do
you could do
they could do

V-ing form

I could be doing
you could be doing
she could be doing
we could be doing
you could be doing
they could be doing

Perfect

I could have done
you could have done
she 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
she 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
she 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
she 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
she 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
she 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 she do?
could we do?
could you do?
could they do?

V-ing form

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

Perfect

could I have done?
could you have done?
could she 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 she 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 she 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 she 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 she 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 she 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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