English verb conjugation COULD IMPROVE

Regular verb: improve - improved - improved

Affirmation

Simple form

I could improve
you could improve
he could improve
we could improve
you could improve
they could improve

V-ing form

I could be improving
you could be improving
he could be improving
we could be improving
you could be improving
they could be improving

Perfect

I could have improved
you could have improved
he could have improved
we could have improved
you could have improved
they could have improved

V-ing perfect

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

Negation

Simple form

I could not improve
you could not improve
he could not improve
we could not improve
you could not improve
they could not improve

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I improve?
could you improve?
could he improve?
could we improve?
could you improve?
could they improve?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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