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 mustn't doubt
you mustn't doubt
he mustn't doubt
we mustn't doubt
you mustn't doubt
they mustn't doubt

V-ing form

I mustn't be doubting
you mustn't be doubting
he mustn't be doubting
we mustn't be doubting
you mustn't be doubting
they mustn't be doubting

Perfect

I mustn't have doubted
you mustn't have doubted
he mustn't have doubted
we mustn't have doubted
you mustn't have doubted
they mustn't have doubted

V-ing perfect

I mustn't have been doubting
you mustn't have been doubting
he mustn't have been doubting
we mustn't have been doubting
you mustn't have been doubting
they mustn't 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

mustn't I doubt?
mustn't you doubt?
mustn't he doubt?
mustn't we doubt?
mustn't you doubt?
mustn't they doubt?

V-ing form

mustn't I be doubting?
mustn't you be doubting?
mustn't he be doubting?
mustn't we be doubting?
mustn't you be doubting?
mustn't they be doubting?

Perfect

mustn't I have doubted?
mustn't you have doubted?
mustn't he have doubted?
mustn't we have doubted?
mustn't you have doubted?
mustn't they have doubted?

V-ing perfect

mustn't I have been doubting?
mustn't you have been doubting?
mustn't he have been doubting?
mustn't we have been doubting?
mustn't you have been doubting?
mustn't they have been doubting?

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