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 couldn't improve
you couldn't improve
he couldn't improve
we couldn't improve
you couldn't improve
they couldn't improve

V-ing form

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

Perfect

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

V-ing perfect

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

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

V-ing form

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

Perfect

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

V-ing perfect

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

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