English verb conjugation MUST LAUGH

Regular verb: laugh - laughed - laughed

Affirmation

Simple form

I must laugh
you must laugh
he must laugh
we must laugh
you must laugh
they must laugh

V-ing form

I must be laughing
you must be laughing
he must be laughing
we must be laughing
you must be laughing
they must be laughing

Perfect

I must have laughed
you must have laughed
he must have laughed
we must have laughed
you must have laughed
they must have laughed

V-ing perfect

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

Negation

Simple form

I mustn't laugh
you mustn't laugh
he mustn't laugh
we mustn't laugh
you mustn't laugh
they mustn't laugh

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I laugh?
must you laugh?
must he laugh?
must we laugh?
must you laugh?
must they laugh?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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