I must presume you must presume she must presume we must presume you must presume they must presume
V-ing form
I must be presuming you must be presuming she must be presuming we must be presuming you must be presuming they must be presuming
Perfect
I must have presumed you must have presumed she must have presumed we must have presumed you must have presumed they must have presumed
V-ing perfect
I must have been presuming you must have been presuming she must have been presuming we must have been presuming you must have been presuming they must have been presuming
Negation
Simple form
I mustn't presume you mustn't presume she mustn't presume we mustn't presume you mustn't presume they mustn't presume
V-ing form
I mustn't be presuming you mustn't be presuming she mustn't be presuming we mustn't be presuming you mustn't be presuming they mustn't be presuming
Perfect
I mustn't have presumed you mustn't have presumed she mustn't have presumed we mustn't have presumed you mustn't have presumed they mustn't have presumed
V-ing perfect
I mustn't have been presuming you mustn't have been presuming she mustn't have been presuming we mustn't have been presuming you mustn't have been presuming they mustn't have been presuming
Interrogative form
Simple form
must I presume? must you presume? must she presume? must we presume? must you presume? must they presume?
V-ing form
must I be presuming? must you be presuming? must she be presuming? must we be presuming? must you be presuming? must they be presuming?
Perfect
must I have presumed? must you have presumed? must she have presumed? must we have presumed? must you have presumed? must they have presumed?
V-ing perfect
must I have been presuming? must you have been presuming? must she have been presuming? must we have been presuming? must you have been presuming? must they have been presuming?
Interro-negative form
Simple form
mustn't I presume? mustn't you presume? mustn't she presume? mustn't we presume? mustn't you presume? mustn't they presume?
V-ing form
mustn't I be presuming? mustn't you be presuming? mustn't she be presuming? mustn't we be presuming? mustn't you be presuming? mustn't they be presuming?
Perfect
mustn't I have presumed? mustn't you have presumed? mustn't she have presumed? mustn't we have presumed? mustn't you have presumed? mustn't they have presumed?
V-ing perfect
mustn't I have been presuming? mustn't you have been presuming? mustn't she have been presuming? mustn't we have been presuming? mustn't you have been presuming? mustn't they have been presuming?