must encumber
Regular verb: encumber - encumbered- encumbered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must encumber
you must encumber
he must encumber
we must encumber
you must encumber
they must encumber 	I must be encumbering
you must be encumbering
he must be encumbering
we must be encumbering
you must be encumbering
they must be encumbering	I must have encumbered
you must have encumbered
he must have encumbered
we must have encumbered
you must have encumbered
they must have encumbered	I must have been encumbering
you must have been encumbering
he must have been encumbering
we must have been encumbering
you must have been encumbering
they must have been encumbering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not encumber
you must not encumber
he must not encumber
we must not encumber
you must not encumber
they must not encumber 	I must not be encumbering
you must not be encumbering
he must not be encumbering
we must not be encumbering
you must not be encumbering
they must not be encumbering	I must not have encumbered
you must not have encumbered
he must not have encumbered
we must not have encumbered
you must not have encumbered
they must not have encumbered	I must not have been encumbering
you must not have been encumbering
he must not have been encumbering
we must not have been encumbering
you must not have been encumbering
they must not have been encumbering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I encumber?
must you encumber?
must he encumber?
must we encumber?
must you encumber?
must they encumber? 	must I be encumbering?
must you be encumbering?
must he be encumbering?
must we be encumbering?
must you be encumbering?
must they be encumbering? 	must I have encumbered?
must you have encumbered?
must he have encumbered?
must we have encumbered?
must you have encumbered?
must they have encumbered? 	must I have been encumbering?
must you have been encumbering?
must he have been encumbering?
must we have been encumbering?
must you have been encumbering?
must they have been encumbering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not encumber?
must you not encumber?
must he not encumber?
must we not encumber?
must you not encumber?
must they not encumber? 	must I not be encumbering?
must you not be encumbering?
must he not be encumbering?
must we not be encumbering?
must you not be encumbering?
must they not be encumbering? 	must I not have encumbered?
must you not have encumbered?
must he not have encumbered?
must we not have encumbered?
must you not have encumbered?
must they not have encumbered? 	must I not have been encumbering?
must you not have been encumbering?
must he not have been encumbering?
must we not have been encumbering?
must you not have been encumbering?
must they not have been encumbering?