I must stripe you must stripe she must stripe we must stripe you must stripe they must stripe
V-ing form
I must be striping you must be striping she must be striping we must be striping you must be striping they must be striping
Perfect
I must have striped you must have striped she must have striped we must have striped you must have striped they must have striped
V-ing perfect
I must have been striping you must have been striping she must have been striping we must have been striping you must have been striping they must have been striping
Negation
Simple form
I must not stripe you must not stripe she must not stripe we must not stripe you must not stripe they must not stripe
V-ing form
I must not be striping you must not be striping she must not be striping we must not be striping you must not be striping they must not be striping
Perfect
I must not have striped you must not have striped she must not have striped we must not have striped you must not have striped they must not have striped
V-ing perfect
I must not have been striping you must not have been striping she must not have been striping we must not have been striping you must not have been striping they must not have been striping
Interrogative form
Simple form
must I stripe? must you stripe? must she stripe? must we stripe? must you stripe? must they stripe?
V-ing form
must I be striping? must you be striping? must she be striping? must we be striping? must you be striping? must they be striping?
Perfect
must I have striped? must you have striped? must she have striped? must we have striped? must you have striped? must they have striped?
V-ing perfect
must I have been striping? must you have been striping? must she have been striping? must we have been striping? must you have been striping? must they have been striping?
Interro-negative form
Simple form
must I not stripe? must you not stripe? must she not stripe? must we not stripe? must you not stripe? must they not stripe?
V-ing form
must I not be striping? must you not be striping? must she not be striping? must we not be striping? must you not be striping? must they not be striping?
Perfect
must I not have striped? must you not have striped? must she not have striped? must we not have striped? must you not have striped? must they not have striped?
V-ing perfect
must I not have been striping? must you not have been striping? must she not have been striping? must we not have been striping? must you not have been striping? must they not have been striping?