English verb conjugation COULD CONTRIBUTE

Regular verb: contribute - contributed - contributed

Affirmation

Simple form

I could contribute
you could contribute
he could contribute
we could contribute
you could contribute
they could contribute

V-ing form

I could be contributing
you could be contributing
he could be contributing
we could be contributing
you could be contributing
they could be contributing

Perfect

I could have contributed
you could have contributed
he could have contributed
we could have contributed
you could have contributed
they could have contributed

V-ing perfect

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

Negation

Simple form

I could not contribute
you could not contribute
he could not contribute
we could not contribute
you could not contribute
they could not contribute

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I contribute?
could you contribute?
could he contribute?
could we contribute?
could you contribute?
could they contribute?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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