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