I must rethink you must rethink he must rethink we must rethink you must rethink they must rethink
V-ing form
I must be rethinking you must be rethinking he must be rethinking we must be rethinking you must be rethinking they must be rethinking
Perfect
I must have rethought you must have rethought he must have rethought we must have rethought you must have rethought they must have rethought
V-ing perfect
I must have been rethinking you must have been rethinking he must have been rethinking we must have been rethinking you must have been rethinking they must have been rethinking
Negation
Simple form
I mustn't rethink you mustn't rethink he mustn't rethink we mustn't rethink you mustn't rethink they mustn't rethink
V-ing form
I mustn't be rethinking you mustn't be rethinking he mustn't be rethinking we mustn't be rethinking you mustn't be rethinking they mustn't be rethinking
Perfect
I mustn't have rethought you mustn't have rethought he mustn't have rethought we mustn't have rethought you mustn't have rethought they mustn't have rethought
V-ing perfect
I mustn't have been rethinking you mustn't have been rethinking he mustn't have been rethinking we mustn't have been rethinking you mustn't have been rethinking they mustn't have been rethinking
Interrogative form
Simple form
must I rethink? must you rethink? must he rethink? must we rethink? must you rethink? must they rethink?
V-ing form
must I be rethinking? must you be rethinking? must he be rethinking? must we be rethinking? must you be rethinking? must they be rethinking?
Perfect
must I have rethought? must you have rethought? must he have rethought? must we have rethought? must you have rethought? must they have rethought?
V-ing perfect
must I have been rethinking? must you have been rethinking? must he have been rethinking? must we have been rethinking? must you have been rethinking? must they have been rethinking?
Interro-negative form
Simple form
mustn't I rethink? mustn't you rethink? mustn't he rethink? mustn't we rethink? mustn't you rethink? mustn't they rethink?
V-ing form
mustn't I be rethinking? mustn't you be rethinking? mustn't he be rethinking? mustn't we be rethinking? mustn't you be rethinking? mustn't they be rethinking?
Perfect
mustn't I have rethought? mustn't you have rethought? mustn't he have rethought? mustn't we have rethought? mustn't you have rethought? mustn't they have rethought?
V-ing perfect
mustn't I have been rethinking? mustn't you have been rethinking? mustn't he have been rethinking? mustn't we have been rethinking? mustn't you have been rethinking? mustn't they have been rethinking?