English verb conjugation MUST FIB

Regular verb: fib - fibbed - fibbed

Affirmation

Simple form

I must fib
you must fib
he must fib
we must fib
you must fib
they must fib

V-ing form

I must be fibbing
you must be fibbing
he must be fibbing
we must be fibbing
you must be fibbing
they must be fibbing

Perfect

I must have fibbed
you must have fibbed
he must have fibbed
we must have fibbed
you must have fibbed
they must have fibbed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I fib?
must you fib?
must he fib?
must we fib?
must you fib?
must they fib?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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