must flounder
Regular verb: flounder - floundered- floundered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must flounder
you must flounder
she must flounder
we must flounder
you must flounder
they must flounder 	I must be floundering
you must be floundering
she must be floundering
we must be floundering
you must be floundering
they must be floundering	I must have floundered
you must have floundered
she must have floundered
we must have floundered
you must have floundered
they must have floundered	I must have been floundering
you must have been floundering
she must have been floundering
we must have been floundering
you must have been floundering
they must have been floundering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not flounder
you must not flounder
she must not flounder
we must not flounder
you must not flounder
they must not flounder 	I must not be floundering
you must not be floundering
she must not be floundering
we must not be floundering
you must not be floundering
they must not be floundering	I must not have floundered
you must not have floundered
she must not have floundered
we must not have floundered
you must not have floundered
they must not have floundered	I must not have been floundering
you must not have been floundering
she must not have been floundering
we must not have been floundering
you must not have been floundering
they must not have been floundering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I flounder?
must you flounder?
must she flounder?
must we flounder?
must you flounder?
must they flounder? 	must I be floundering?
must you be floundering?
must she be floundering?
must we be floundering?
must you be floundering?
must they be floundering? 	must I have floundered?
must you have floundered?
must she have floundered?
must we have floundered?
must you have floundered?
must they have floundered? 	must I have been floundering?
must you have been floundering?
must she have been floundering?
must we have been floundering?
must you have been floundering?
must they have been floundering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not flounder?
must you not flounder?
must she not flounder?
must we not flounder?
must you not flounder?
must they not flounder? 	must I not be floundering?
must you not be floundering?
must she not be floundering?
must we not be floundering?
must you not be floundering?
must they not be floundering? 	must I not have floundered?
must you not have floundered?
must she not have floundered?
must we not have floundered?
must you not have floundered?
must they not have floundered? 	must I not have been floundering?
must you not have been floundering?
must she not have been floundering?
must we not have been floundering?
must you not have been floundering?
must they not have been floundering?