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