I must acquire you must acquire she must acquire we must acquire you must acquire they must acquire
V-ing form
I must be acquiring you must be acquiring she must be acquiring we must be acquiring you must be acquiring they must be acquiring
Perfect
I must have acquired you must have acquired she 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 she 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 she 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 she 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 she 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 she 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 she acquire? must we acquire? must you acquire? must they acquire?
V-ing form
must I be acquiring? must you be acquiring? must she be acquiring? must we be acquiring? must you be acquiring? must they be acquiring?
Perfect
must I have acquired? must you have acquired? must she 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 she 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 she 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 she 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 she 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 she have been acquiring? mustn't we have been acquiring? mustn't you have been acquiring? mustn't they have been acquiring?