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 mustn't flounder
you mustn't flounder
she mustn't flounder
we mustn't flounder
you mustn't flounder
they mustn't flounder 	I mustn't be floundering
you mustn't be floundering
she mustn't be floundering
we mustn't be floundering
you mustn't be floundering
they mustn't be floundering	I mustn't have floundered
you mustn't have floundered
she mustn't have floundered
we mustn't have floundered
you mustn't have floundered
they mustn't have floundered	I mustn't have been floundering
you mustn't have been floundering
she mustn't have been floundering
we mustn't have been floundering
you mustn't have been floundering
they mustn't 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 	
mustn't I flounder?
mustn't you flounder?
mustn't she flounder?
mustn't we flounder?
mustn't you flounder?
mustn't they flounder? 	mustn't I be floundering?
mustn't you be floundering?
mustn't she be floundering?
mustn't we be floundering?
mustn't you be floundering?
mustn't they be floundering? 	mustn't I have floundered?
mustn't you have floundered?
mustn't she have floundered?
mustn't we have floundered?
mustn't you have floundered?
mustn't they have floundered? 	mustn't I have been floundering?
mustn't you have been floundering?
mustn't she have been floundering?
mustn't we have been floundering?
mustn't you have been floundering?
mustn't they have been floundering?