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 couldn't contribute
you couldn't contribute
he couldn't contribute
we couldn't contribute
you couldn't contribute
they couldn't contribute

V-ing form

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

Perfect

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

V-ing perfect

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

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

V-ing form

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

Perfect

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

V-ing perfect

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

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