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 mustn't stripe you mustn't stripe she mustn't stripe we mustn't stripe you mustn't stripe they mustn't stripe
V-ing form
I mustn't be striping you mustn't be striping she mustn't be striping we mustn't be striping you mustn't be striping they mustn't be striping
Perfect
I mustn't have striped you mustn't have striped she mustn't have striped we mustn't have striped you mustn't have striped they mustn't have striped
V-ing perfect
I mustn't have been striping you mustn't have been striping she mustn't have been striping we mustn't have been striping you mustn't have been striping they mustn't 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
mustn't I stripe? mustn't you stripe? mustn't she stripe? mustn't we stripe? mustn't you stripe? mustn't they stripe?
V-ing form
mustn't I be striping? mustn't you be striping? mustn't she be striping? mustn't we be striping? mustn't you be striping? mustn't they be striping?
Perfect
mustn't I have striped? mustn't you have striped? mustn't she have striped? mustn't we have striped? mustn't you have striped? mustn't they have striped?
V-ing perfect
mustn't I have been striping? mustn't you have been striping? mustn't she have been striping? mustn't we have been striping? mustn't you have been striping? mustn't they have been striping?