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