I can force you can force he can force we can force you can force they can force
V-ing form
I can be forcing you can be forcing he can be forcing we can be forcing you can be forcing they can be forcing
Perfect
I can have forced you can have forced he can have forced we can have forced you can have forced they can have forced
V-ing perfect
I can have been forcing you can have been forcing he can have been forcing we can have been forcing you can have been forcing they can have been forcing
Negation
Simple form
I can't force you can't force he can't force we can't force you can't force they can't force
V-ing form
I can't be forcing you can't be forcing he can't be forcing we can't be forcing you can't be forcing they can't be forcing
Perfect
I can't have forced you can't have forced he can't have forced we can't have forced you can't have forced they can't have forced
V-ing perfect
I can't have been forcing you can't have been forcing he can't have been forcing we can't have been forcing you can't have been forcing they can't have been forcing
Interrogative form
Simple form
can I force? can you force? can he force? can we force? can you force? can they force?
V-ing form
can I be forcing? can you be forcing? can he be forcing? can we be forcing? can you be forcing? can they be forcing?
Perfect
can I have forced? can you have forced? can he have forced? can we have forced? can you have forced? can they have forced?
V-ing perfect
can I have been forcing? can you have been forcing? can he have been forcing? can we have been forcing? can you have been forcing? can they have been forcing?
Interro-negative form
Simple form
can't I force? can't you force? can't he force? can't we force? can't you force? can't they force?
V-ing form
can't I be forcing? can't you be forcing? can't he be forcing? can't we be forcing? can't you be forcing? can't they be forcing?
Perfect
can't I have forced? can't you have forced? can't he have forced? can't we have forced? can't you have forced? can't they have forced?
V-ing perfect
can't I have been forcing? can't you have been forcing? can't he have been forcing? can't we have been forcing? can't you have been forcing? can't they have been forcing?