I must crimp you must crimp she must crimp we must crimp you must crimp they must crimp
V-ing form
I must be crimping you must be crimping she must be crimping we must be crimping you must be crimping they must be crimping
Perfect
I must have crimped you must have crimped she must have crimped we must have crimped you must have crimped they must have crimped
V-ing perfect
I must have been crimping you must have been crimping she must have been crimping we must have been crimping you must have been crimping they must have been crimping
Negation
Simple form
I must not crimp you must not crimp she must not crimp we must not crimp you must not crimp they must not crimp
V-ing form
I must not be crimping you must not be crimping she must not be crimping we must not be crimping you must not be crimping they must not be crimping
Perfect
I must not have crimped you must not have crimped she must not have crimped we must not have crimped you must not have crimped they must not have crimped
V-ing perfect
I must not have been crimping you must not have been crimping she must not have been crimping we must not have been crimping you must not have been crimping they must not have been crimping
Interrogative form
Simple form
must I crimp? must you crimp? must she crimp? must we crimp? must you crimp? must they crimp?
V-ing form
must I be crimping? must you be crimping? must she be crimping? must we be crimping? must you be crimping? must they be crimping?
Perfect
must I have crimped? must you have crimped? must she have crimped? must we have crimped? must you have crimped? must they have crimped?
V-ing perfect
must I have been crimping? must you have been crimping? must she have been crimping? must we have been crimping? must you have been crimping? must they have been crimping?
Interro-negative form
Simple form
must I not crimp? must you not crimp? must she not crimp? must we not crimp? must you not crimp? must they not crimp?
V-ing form
must I not be crimping? must you not be crimping? must she not be crimping? must we not be crimping? must you not be crimping? must they not be crimping?
Perfect
must I not have crimped? must you not have crimped? must she not have crimped? must we not have crimped? must you not have crimped? must they not have crimped?
V-ing perfect
must I not have been crimping? must you not have been crimping? must she not have been crimping? must we not have been crimping? must you not have been crimping? must they not have been crimping?