must flat
Regular verb: flat - flated- flated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must flat
you must flat
she must flat
we must flat
you must flat
they must flat 	I must be flating
you must be flating
she must be flating
we must be flating
you must be flating
they must be flating	I must have flated
you must have flated
she must have flated
we must have flated
you must have flated
they must have flated	I must have been flating
you must have been flating
she must have been flating
we must have been flating
you must have been flating
they must have been flating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't flat
you mustn't flat
she mustn't flat
we mustn't flat
you mustn't flat
they mustn't flat 	I mustn't be flating
you mustn't be flating
she mustn't be flating
we mustn't be flating
you mustn't be flating
they mustn't be flating	I mustn't have flated
you mustn't have flated
she mustn't have flated
we mustn't have flated
you mustn't have flated
they mustn't have flated	I mustn't have been flating
you mustn't have been flating
she mustn't have been flating
we mustn't have been flating
you mustn't have been flating
they mustn't have been flating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I flat?
must you flat?
must she flat?
must we flat?
must you flat?
must they flat? 	must I be flating?
must you be flating?
must she be flating?
must we be flating?
must you be flating?
must they be flating? 	must I have flated?
must you have flated?
must she have flated?
must we have flated?
must you have flated?
must they have flated? 	must I have been flating?
must you have been flating?
must she have been flating?
must we have been flating?
must you have been flating?
must they have been flating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I flat?
mustn't you flat?
mustn't she flat?
mustn't we flat?
mustn't you flat?
mustn't they flat? 	mustn't I be flating?
mustn't you be flating?
mustn't she be flating?
mustn't we be flating?
mustn't you be flating?
mustn't they be flating? 	mustn't I have flated?
mustn't you have flated?
mustn't she have flated?
mustn't we have flated?
mustn't you have flated?
mustn't they have flated? 	mustn't I have been flating?
mustn't you have been flating?
mustn't she have been flating?
mustn't we have been flating?
mustn't you have been flating?
mustn't they have been flating?