I must crush you must crush he must crush we must crush you must crush they must crush
V-ing form
I must be crushing you must be crushing he must be crushing we must be crushing you must be crushing they must be crushing
Perfect
I must have crushed you must have crushed he must have crushed we must have crushed you must have crushed they must have crushed
V-ing perfect
I must have been crushing you must have been crushing he must have been crushing we must have been crushing you must have been crushing they must have been crushing
Negation
Simple form
I must not crush you must not crush he must not crush we must not crush you must not crush they must not crush
V-ing form
I must not be crushing you must not be crushing he must not be crushing we must not be crushing you must not be crushing they must not be crushing
Perfect
I must not have crushed you must not have crushed he must not have crushed we must not have crushed you must not have crushed they must not have crushed
V-ing perfect
I must not have been crushing you must not have been crushing he must not have been crushing we must not have been crushing you must not have been crushing they must not have been crushing
Interrogative form
Simple form
must I crush? must you crush? must he crush? must we crush? must you crush? must they crush?
V-ing form
must I be crushing? must you be crushing? must he be crushing? must we be crushing? must you be crushing? must they be crushing?
Perfect
must I have crushed? must you have crushed? must he have crushed? must we have crushed? must you have crushed? must they have crushed?
V-ing perfect
must I have been crushing? must you have been crushing? must he have been crushing? must we have been crushing? must you have been crushing? must they have been crushing?
Interro-negative form
Simple form
must I not crush? must you not crush? must he not crush? must we not crush? must you not crush? must they not crush?
V-ing form
must I not be crushing? must you not be crushing? must he not be crushing? must we not be crushing? must you not be crushing? must they not be crushing?
Perfect
must I not have crushed? must you not have crushed? must he not have crushed? must we not have crushed? must you not have crushed? must they not have crushed?
V-ing perfect
must I not have been crushing? must you not have been crushing? must he not have been crushing? must we not have been crushing? must you not have been crushing? must they not have been crushing?