I could crimp you could crimp he could crimp we could crimp you could crimp they could crimp
V-ing form
I could be crimping you could be crimping he could be crimping we could be crimping you could be crimping they could be crimping
Perfect
I could have crimped you could have crimped he could have crimped we could have crimped you could have crimped they could have crimped
V-ing perfect
I could have been crimping you could have been crimping he could have been crimping we could have been crimping you could have been crimping they could have been crimping
Negation
Simple form
I couldn't crimp you couldn't crimp he couldn't crimp we couldn't crimp you couldn't crimp they couldn't crimp
V-ing form
I couldn't be crimping you couldn't be crimping he couldn't be crimping we couldn't be crimping you couldn't be crimping they couldn't be crimping
Perfect
I couldn't have crimped you couldn't have crimped he couldn't have crimped we couldn't have crimped you couldn't have crimped they couldn't have crimped
V-ing perfect
I couldn't have been crimping you couldn't have been crimping he couldn't have been crimping we couldn't have been crimping you couldn't have been crimping they couldn't have been crimping
Interrogative form
Simple form
could I crimp? could you crimp? could he crimp? could we crimp? could you crimp? could they crimp?
V-ing form
could I be crimping? could you be crimping? could he be crimping? could we be crimping? could you be crimping? could they be crimping?
Perfect
could I have crimped? could you have crimped? could he have crimped? could we have crimped? could you have crimped? could they have crimped?
V-ing perfect
could I have been crimping? could you have been crimping? could he have been crimping? could we have been crimping? could you have been crimping? could they have been crimping?
Interro-negative form
Simple form
couldn't I crimp? couldn't you crimp? couldn't he crimp? couldn't we crimp? couldn't you crimp? couldn't they crimp?
V-ing form
couldn't I be crimping? couldn't you be crimping? couldn't he be crimping? couldn't we be crimping? couldn't you be crimping? couldn't they be crimping?
Perfect
couldn't I have crimped? couldn't you have crimped? couldn't he have crimped? couldn't we have crimped? couldn't you have crimped? couldn't they have crimped?
V-ing perfect
couldn't I have been crimping? couldn't you have been crimping? couldn't he have been crimping? couldn't we have been crimping? couldn't you have been crimping? couldn't they have been crimping?