must encumber
Regular verb: encumber - encumbered- encumbered

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