English verb conjugation COULD CHECK

Regular verb: check - checked - checked

Affirmation

Simple form

I could check
you could check
she could check
we could check
you could check
they could check

V-ing form

I could be checking
you could be checking
she could be checking
we could be checking
you could be checking
they could be checking

Perfect

I could have checked
you could have checked
she could have checked
we could have checked
you could have checked
they could have checked

V-ing perfect

I could have been checking
you could have been checking
she could have been checking
we could have been checking
you could have been checking
they could have been checking

Negation

Simple form

I could not check
you could not check
she could not check
we could not check
you could not check
they could not check

V-ing form

I could not be checking
you could not be checking
she could not be checking
we could not be checking
you could not be checking
they could not be checking

Perfect

I could not have checked
you could not have checked
she could not have checked
we could not have checked
you could not have checked
they could not have checked

V-ing perfect

I could not have been checking
you could not have been checking
she could not have been checking
we could not have been checking
you could not have been checking
they could not have been checking

Interrogative form

Simple form

could I check?
could you check?
could she check?
could we check?
could you check?
could they check?

V-ing form

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

Perfect

could I have checked?
could you have checked?
could she have checked?
could we have checked?
could you have checked?
could they have checked?

V-ing perfect

could I have been checking?
could you have been checking?
could she have been checking?
could we have been checking?
could you have been checking?
could they have been checking?

Interro-negative form

Simple form

could I not check?
could you not check?
could she not check?
could we not check?
could you not check?
could they not check?

V-ing form

could I not be checking?
could you not be checking?
could she not be checking?
could we not be checking?
could you not be checking?
could they not be checking?

Perfect

could I not have checked?
could you not have checked?
could she not have checked?
could we not have checked?
could you not have checked?
could they not have checked?

V-ing perfect

could I not have been checking?
could you not have been checking?
could she not have been checking?
could we not have been checking?
could you not have been checking?
could they not have been checking?

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