English verb conjugation CAN CONTRIBUTE

Regular verb: contribute - contributed - contributed

Affirmation

Simple form

I can contribute
you can contribute
he can contribute
we can contribute
you can contribute
they can contribute

V-ing form

I can be contributing
you can be contributing
he can be contributing
we can be contributing
you can be contributing
they can be contributing

Perfect

I can have contributed
you can have contributed
he 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
he can have been contributing
we can have been contributing
you can have been contributing
they can have been contributing

Negation

Simple form

I can't contribute
you can't contribute
he can't contribute
we can't contribute
you can't contribute
they can't contribute

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

can I contribute?
can you contribute?
can he contribute?
can we contribute?
can you contribute?
can they contribute?

V-ing form

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

Perfect

can I have contributed?
can you have contributed?
can he 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 he have been contributing?
can we have been contributing?
can you have been contributing?
can they have been contributing?

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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