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