English verb conjugation CAN CONTRIBUTE

Regular verb: contribute - contributed - contributed

Affirmation

Simple form

I can contribute
you can contribute
she can contribute
we can contribute
you can contribute
they can contribute

V-ing form

I can be contributing
you can be contributing
she can be contributing
we can be contributing
you can be contributing
they can be contributing

Perfect

I can have contributed
you can have contributed
she can have contributed
we can have contributed
you can have contributed
they can have contributed

V-ing perfect

I can have been contributing
you can have been contributing
she can have been contributing
we can have been contributing
you can have been contributing
they can have been contributing

Negation

Simple form

I cannot contribute
you cannot contribute
she cannot contribute
we cannot contribute
you cannot contribute
they cannot contribute

V-ing form

I cannot be contributing
you cannot be contributing
she cannot be contributing
we cannot be contributing
you cannot be contributing
they cannot be contributing

Perfect

I cannot have contributed
you cannot have contributed
she cannot have contributed
we cannot have contributed
you cannot have contributed
they cannot have contributed

V-ing perfect

I cannot have been contributing
you cannot have been contributing
she cannot have been contributing
we cannot have been contributing
you cannot have been contributing
they cannot have been contributing

Interrogative form

Simple form

can I contribute?
can you contribute?
can she contribute?
can we contribute?
can you contribute?
can they contribute?

V-ing form

can I be contributing?
can you be contributing?
can she be contributing?
can we be contributing?
can you be contributing?
can they be contributing?

Perfect

can I have contributed?
can you have contributed?
can she have contributed?
can we have contributed?
can you have contributed?
can they have contributed?

V-ing perfect

can I have been contributing?
can you have been contributing?
can she have been contributing?
can we have been contributing?
can you have been contributing?
can they have been contributing?

Interro-negative form

Simple form

can I not contribute?
can you not contribute?
can she not contribute?
can we not contribute?
can you not contribute?
can they not contribute?

V-ing form

can I not be contributing?
can you not be contributing?
can she not be contributing?
can we not be contributing?
can you not be contributing?
can they not be contributing?

Perfect

can I not have contributed?
can you not have contributed?
can she not have contributed?
can we not have contributed?
can you not have contributed?
can they not have contributed?

V-ing perfect

can I not have been contributing?
can you not have been contributing?
can she not have been contributing?
can we not have been contributing?
can you not have been contributing?
can they not have been contributing?

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