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