English verb conjugation MUST SUSTAIN

Regular verb: sustain - sustained - sustained

Affirmation

Simple form

I must sustain
you must sustain
he must sustain
we must sustain
you must sustain
they must sustain

V-ing form

I must be sustaining
you must be sustaining
he must be sustaining
we must be sustaining
you must be sustaining
they must be sustaining

Perfect

I must have sustained
you must have sustained
he must have sustained
we must have sustained
you must have sustained
they must have sustained

V-ing perfect

I must have been sustaining
you must have been sustaining
he must have been sustaining
we must have been sustaining
you must have been sustaining
they must have been sustaining

Negation

Simple form

I must not sustain
you must not sustain
he must not sustain
we must not sustain
you must not sustain
they must not sustain

V-ing form

I must not be sustaining
you must not be sustaining
he must not be sustaining
we must not be sustaining
you must not be sustaining
they must not be sustaining

Perfect

I must not have sustained
you must not have sustained
he must not have sustained
we must not have sustained
you must not have sustained
they must not have sustained

V-ing perfect

I must not have been sustaining
you must not have been sustaining
he must not have been sustaining
we must not have been sustaining
you must not have been sustaining
they must not have been sustaining

Interrogative form

Simple form

must I sustain?
must you sustain?
must he sustain?
must we sustain?
must you sustain?
must they sustain?

V-ing form

must I be sustaining?
must you be sustaining?
must he be sustaining?
must we be sustaining?
must you be sustaining?
must they be sustaining?

Perfect

must I have sustained?
must you have sustained?
must he have sustained?
must we have sustained?
must you have sustained?
must they have sustained?

V-ing perfect

must I have been sustaining?
must you have been sustaining?
must he have been sustaining?
must we have been sustaining?
must you have been sustaining?
must they have been sustaining?

Interro-negative form

Simple form

must I not sustain?
must you not sustain?
must he not sustain?
must we not sustain?
must you not sustain?
must they not sustain?

V-ing form

must I not be sustaining?
must you not be sustaining?
must he not be sustaining?
must we not be sustaining?
must you not be sustaining?
must they not be sustaining?

Perfect

must I not have sustained?
must you not have sustained?
must he not have sustained?
must we not have sustained?
must you not have sustained?
must they not have sustained?

V-ing perfect

must I not have been sustaining?
must you not have been sustaining?
must he not have been sustaining?
must we not have been sustaining?
must you not have been sustaining?
must they not have been sustaining?

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