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