I must approximate you must approximate he must approximate we must approximate you must approximate they must approximate
V-ing form
I must be approximating you must be approximating he must be approximating we must be approximating you must be approximating they must be approximating
Perfect
I must have approximated you must have approximated he must have approximated we must have approximated you must have approximated they must have approximated
V-ing perfect
I must have been approximating you must have been approximating he must have been approximating we must have been approximating you must have been approximating they must have been approximating
Negation
Simple form
I must not approximate you must not approximate he must not approximate we must not approximate you must not approximate they must not approximate
V-ing form
I must not be approximating you must not be approximating he must not be approximating we must not be approximating you must not be approximating they must not be approximating
Perfect
I must not have approximated you must not have approximated he must not have approximated we must not have approximated you must not have approximated they must not have approximated
V-ing perfect
I must not have been approximating you must not have been approximating he must not have been approximating we must not have been approximating you must not have been approximating they must not have been approximating
Interrogative form
Simple form
must I approximate? must you approximate? must he approximate? must we approximate? must you approximate? must they approximate?
V-ing form
must I be approximating? must you be approximating? must he be approximating? must we be approximating? must you be approximating? must they be approximating?
Perfect
must I have approximated? must you have approximated? must he have approximated? must we have approximated? must you have approximated? must they have approximated?
V-ing perfect
must I have been approximating? must you have been approximating? must he have been approximating? must we have been approximating? must you have been approximating? must they have been approximating?
Interro-negative form
Simple form
must I not approximate? must you not approximate? must he not approximate? must we not approximate? must you not approximate? must they not approximate?
V-ing form
must I not be approximating? must you not be approximating? must he not be approximating? must we not be approximating? must you not be approximating? must they not be approximating?
Perfect
must I not have approximated? must you not have approximated? must he not have approximated? must we not have approximated? must you not have approximated? must they not have approximated?
V-ing perfect
must I not have been approximating? must you not have been approximating? must he not have been approximating? must we not have been approximating? must you not have been approximating? must they not have been approximating?