I must push you must push he must push we must push you must push they must push
V-ing form
I must be pushing you must be pushing he must be pushing we must be pushing you must be pushing they must be pushing
Perfect
I must have pushed you must have pushed he must have pushed we must have pushed you must have pushed they must have pushed
V-ing perfect
I must have been pushing you must have been pushing he must have been pushing we must have been pushing you must have been pushing they must have been pushing
Negation
Simple form
I must not push you must not push he must not push we must not push you must not push they must not push
V-ing form
I must not be pushing you must not be pushing he must not be pushing we must not be pushing you must not be pushing they must not be pushing
Perfect
I must not have pushed you must not have pushed he must not have pushed we must not have pushed you must not have pushed they must not have pushed
V-ing perfect
I must not have been pushing you must not have been pushing he must not have been pushing we must not have been pushing you must not have been pushing they must not have been pushing
Interrogative form
Simple form
must I push? must you push? must he push? must we push? must you push? must they push?
V-ing form
must I be pushing? must you be pushing? must he be pushing? must we be pushing? must you be pushing? must they be pushing?
Perfect
must I have pushed? must you have pushed? must he have pushed? must we have pushed? must you have pushed? must they have pushed?
V-ing perfect
must I have been pushing? must you have been pushing? must he have been pushing? must we have been pushing? must you have been pushing? must they have been pushing?
Interro-negative form
Simple form
must I not push? must you not push? must he not push? must we not push? must you not push? must they not push?
V-ing form
must I not be pushing? must you not be pushing? must he not be pushing? must we not be pushing? must you not be pushing? must they not be pushing?
Perfect
must I not have pushed? must you not have pushed? must he not have pushed? must we not have pushed? must you not have pushed? must they not have pushed?
V-ing perfect
must I not have been pushing? must you not have been pushing? must he not have been pushing? must we not have been pushing? must you not have been pushing? must they not have been pushing?