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