I must abbreviate you must abbreviate he must abbreviate we must abbreviate you must abbreviate they must abbreviate
V-ing form
I must be abbreviating you must be abbreviating he must be abbreviating we must be abbreviating you must be abbreviating they must be abbreviating
Perfect
I must have abbreviated you must have abbreviated he 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 he must have been abbreviating we must have been abbreviating you must have been abbreviating they must have been abbreviating
Negation
Simple form
I must not abbreviate you must not abbreviate he must not abbreviate we must not abbreviate you must not abbreviate they must not abbreviate
V-ing form
I must not be abbreviating you must not be abbreviating he must not be abbreviating we must not be abbreviating you must not be abbreviating they must not be abbreviating
Perfect
I must not have abbreviated you must not have abbreviated he must not have abbreviated we must not have abbreviated you must not have abbreviated they must not have abbreviated
V-ing perfect
I must not have been abbreviating you must not have been abbreviating he must not have been abbreviating we must not have been abbreviating you must not have been abbreviating they must not have been abbreviating
Interrogative form
Simple form
must I abbreviate? must you abbreviate? must he abbreviate? must we abbreviate? must you abbreviate? must they abbreviate?
V-ing form
must I be abbreviating? must you be abbreviating? must he be abbreviating? must we be abbreviating? must you be abbreviating? must they be abbreviating?
Perfect
must I have abbreviated? must you have abbreviated? must he 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 he have been abbreviating? must we have been abbreviating? must you have been abbreviating? must they have been abbreviating?
Interro-negative form
Simple form
must I not abbreviate? must you not abbreviate? must he not abbreviate? must we not abbreviate? must you not abbreviate? must they not abbreviate?
V-ing form
must I not be abbreviating? must you not be abbreviating? must he not be abbreviating? must we not be abbreviating? must you not be abbreviating? must they not be abbreviating?
Perfect
must I not have abbreviated? must you not have abbreviated? must he not have abbreviated? must we not have abbreviated? must you not have abbreviated? must they not have abbreviated?
V-ing perfect
must I not have been abbreviating? must you not have been abbreviating? must he not have been abbreviating? must we not have been abbreviating? must you not have been abbreviating? must they not have been abbreviating?