must apprehend
Regular verb: apprehend - apprehended- apprehended

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must apprehend
you must apprehend
he must apprehend
we must apprehend
you must apprehend
they must apprehend 	I must be apprehending
you must be apprehending
he must be apprehending
we must be apprehending
you must be apprehending
they must be apprehending	I must have apprehended
you must have apprehended
he must have apprehended
we must have apprehended
you must have apprehended
they must have apprehended	I must have been apprehending
you must have been apprehending
he must have been apprehending
we must have been apprehending
you must have been apprehending
they must have been apprehending	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not apprehend
you must not apprehend
he must not apprehend
we must not apprehend
you must not apprehend
they must not apprehend 	I must not be apprehending
you must not be apprehending
he must not be apprehending
we must not be apprehending
you must not be apprehending
they must not be apprehending	I must not have apprehended
you must not have apprehended
he must not have apprehended
we must not have apprehended
you must not have apprehended
they must not have apprehended	I must not have been apprehending
you must not have been apprehending
he must not have been apprehending
we must not have been apprehending
you must not have been apprehending
they must not have been apprehending	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I apprehend?
must you apprehend?
must he apprehend?
must we apprehend?
must you apprehend?
must they apprehend? 	must I be apprehending?
must you be apprehending?
must he be apprehending?
must we be apprehending?
must you be apprehending?
must they be apprehending? 	must I have apprehended?
must you have apprehended?
must he have apprehended?
must we have apprehended?
must you have apprehended?
must they have apprehended? 	must I have been apprehending?
must you have been apprehending?
must he have been apprehending?
must we have been apprehending?
must you have been apprehending?
must they have been apprehending? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not apprehend?
must you not apprehend?
must he not apprehend?
must we not apprehend?
must you not apprehend?
must they not apprehend? 	must I not be apprehending?
must you not be apprehending?
must he not be apprehending?
must we not be apprehending?
must you not be apprehending?
must they not be apprehending? 	must I not have apprehended?
must you not have apprehended?
must he not have apprehended?
must we not have apprehended?
must you not have apprehended?
must they not have apprehended? 	must I not have been apprehending?
must you not have been apprehending?
must he not have been apprehending?
must we not have been apprehending?
must you not have been apprehending?
must they not have been apprehending?