English verb conjugation MUST DOUBT

Regular verb: doubt - doubted - doubted

Affirmation

Simple form

I must doubt
you must doubt
he must doubt
we must doubt
you must doubt
they must doubt

V-ing form

I must be doubting
you must be doubting
he must be doubting
we must be doubting
you must be doubting
they must be doubting

Perfect

I must have doubted
you must have doubted
he must have doubted
we must have doubted
you must have doubted
they must have doubted

V-ing perfect

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

Negation

Simple form

I must not doubt
you must not doubt
he must not doubt
we must not doubt
you must not doubt
they must not doubt

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I doubt?
must you doubt?
must he doubt?
must we doubt?
must you doubt?
must they doubt?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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