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