English verb conjugation MUST CONTRIBUTE

Regular verb: contribute - contributed - contributed

Affirmation

Simple form

I must contribute
you must contribute
she must contribute
we must contribute
you must contribute
they must contribute

V-ing form

I must be contributing
you must be contributing
she must be contributing
we must be contributing
you must be contributing
they must be contributing

Perfect

I must have contributed
you must have contributed
she must have contributed
we must have contributed
you must have contributed
they must have contributed

V-ing perfect

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

Negation

Simple form

I must not contribute
you must not contribute
she must not contribute
we must not contribute
you must not contribute
they must not contribute

V-ing form

I must not be contributing
you must not be contributing
she must not be contributing
we must not be contributing
you must not be contributing
they must not be contributing

Perfect

I must not have contributed
you must not have contributed
she must not have contributed
we must not have contributed
you must not have contributed
they must not have contributed

V-ing perfect

I must not have been contributing
you must not have been contributing
she must not have been contributing
we must not have been contributing
you must not have been contributing
they must not have been contributing

Interrogative form

Simple form

must I contribute?
must you contribute?
must she contribute?
must we contribute?
must you contribute?
must they contribute?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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