must blunder
Regular verb: blunder - blundered- blundered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must blunder
you must blunder
she must blunder
we must blunder
you must blunder
they must blunder 	I must be blundering
you must be blundering
she must be blundering
we must be blundering
you must be blundering
they must be blundering	I must have blundered
you must have blundered
she must have blundered
we must have blundered
you must have blundered
they must have blundered	I must have been blundering
you must have been blundering
she must have been blundering
we must have been blundering
you must have been blundering
they must have been blundering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not blunder
you must not blunder
she must not blunder
we must not blunder
you must not blunder
they must not blunder 	I must not be blundering
you must not be blundering
she must not be blundering
we must not be blundering
you must not be blundering
they must not be blundering	I must not have blundered
you must not have blundered
she must not have blundered
we must not have blundered
you must not have blundered
they must not have blundered	I must not have been blundering
you must not have been blundering
she must not have been blundering
we must not have been blundering
you must not have been blundering
they must not have been blundering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I blunder?
must you blunder?
must she blunder?
must we blunder?
must you blunder?
must they blunder? 	must I be blundering?
must you be blundering?
must she be blundering?
must we be blundering?
must you be blundering?
must they be blundering? 	must I have blundered?
must you have blundered?
must she have blundered?
must we have blundered?
must you have blundered?
must they have blundered? 	must I have been blundering?
must you have been blundering?
must she have been blundering?
must we have been blundering?
must you have been blundering?
must they have been blundering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not blunder?
must you not blunder?
must she not blunder?
must we not blunder?
must you not blunder?
must they not blunder? 	must I not be blundering?
must you not be blundering?
must she not be blundering?
must we not be blundering?
must you not be blundering?
must they not be blundering? 	must I not have blundered?
must you not have blundered?
must she not have blundered?
must we not have blundered?
must you not have blundered?
must they not have blundered? 	must I not have been blundering?
must you not have been blundering?
must she not have been blundering?
must we not have been blundering?
must you not have been blundering?
must they not have been blundering?