I must fast-forward you must fast-forward he must fast-forward we must fast-forward you must fast-forward they must fast-forward
V-ing form
I must be fast-forwarding you must be fast-forwarding he must be fast-forwarding we must be fast-forwarding you must be fast-forwarding they must be fast-forwarding
Perfect
I must have fast-forwarded you must have fast-forwarded he must have fast-forwarded we must have fast-forwarded you must have fast-forwarded they must have fast-forwarded
V-ing perfect
I must have been fast-forwarding you must have been fast-forwarding he must have been fast-forwarding we must have been fast-forwarding you must have been fast-forwarding they must have been fast-forwarding
Negation
Simple form
I mustn't fast-forward you mustn't fast-forward he mustn't fast-forward we mustn't fast-forward you mustn't fast-forward they mustn't fast-forward
V-ing form
I mustn't be fast-forwarding you mustn't be fast-forwarding he mustn't be fast-forwarding we mustn't be fast-forwarding you mustn't be fast-forwarding they mustn't be fast-forwarding
Perfect
I mustn't have fast-forwarded you mustn't have fast-forwarded he mustn't have fast-forwarded we mustn't have fast-forwarded you mustn't have fast-forwarded they mustn't have fast-forwarded
V-ing perfect
I mustn't have been fast-forwarding you mustn't have been fast-forwarding he mustn't have been fast-forwarding we mustn't have been fast-forwarding you mustn't have been fast-forwarding they mustn't have been fast-forwarding
Interrogative form
Simple form
must I fast-forward? must you fast-forward? must he fast-forward? must we fast-forward? must you fast-forward? must they fast-forward?
V-ing form
must I be fast-forwarding? must you be fast-forwarding? must he be fast-forwarding? must we be fast-forwarding? must you be fast-forwarding? must they be fast-forwarding?
Perfect
must I have fast-forwarded? must you have fast-forwarded? must he have fast-forwarded? must we have fast-forwarded? must you have fast-forwarded? must they have fast-forwarded?
V-ing perfect
must I have been fast-forwarding? must you have been fast-forwarding? must he have been fast-forwarding? must we have been fast-forwarding? must you have been fast-forwarding? must they have been fast-forwarding?
Interro-negative form
Simple form
mustn't I fast-forward? mustn't you fast-forward? mustn't he fast-forward? mustn't we fast-forward? mustn't you fast-forward? mustn't they fast-forward?
V-ing form
mustn't I be fast-forwarding? mustn't you be fast-forwarding? mustn't he be fast-forwarding? mustn't we be fast-forwarding? mustn't you be fast-forwarding? mustn't they be fast-forwarding?
Perfect
mustn't I have fast-forwarded? mustn't you have fast-forwarded? mustn't he have fast-forwarded? mustn't we have fast-forwarded? mustn't you have fast-forwarded? mustn't they have fast-forwarded?
V-ing perfect
mustn't I have been fast-forwarding? mustn't you have been fast-forwarding? mustn't he have been fast-forwarding? mustn't we have been fast-forwarding? mustn't you have been fast-forwarding? mustn't they have been fast-forwarding?