must seesaw
Regular verb: seesaw - seesawed- seesawed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must seesaw
you must seesaw
he must seesaw
we must seesaw
you must seesaw
they must seesaw 	I must be seesawing
you must be seesawing
he must be seesawing
we must be seesawing
you must be seesawing
they must be seesawing	I must have seesawed
you must have seesawed
he must have seesawed
we must have seesawed
you must have seesawed
they must have seesawed	I must have been seesawing
you must have been seesawing
he must have been seesawing
we must have been seesawing
you must have been seesawing
they must have been seesawing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't seesaw
you mustn't seesaw
he mustn't seesaw
we mustn't seesaw
you mustn't seesaw
they mustn't seesaw 	I mustn't be seesawing
you mustn't be seesawing
he mustn't be seesawing
we mustn't be seesawing
you mustn't be seesawing
they mustn't be seesawing	I mustn't have seesawed
you mustn't have seesawed
he mustn't have seesawed
we mustn't have seesawed
you mustn't have seesawed
they mustn't have seesawed	I mustn't have been seesawing
you mustn't have been seesawing
he mustn't have been seesawing
we mustn't have been seesawing
you mustn't have been seesawing
they mustn't have been seesawing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I seesaw?
must you seesaw?
must he seesaw?
must we seesaw?
must you seesaw?
must they seesaw? 	must I be seesawing?
must you be seesawing?
must he be seesawing?
must we be seesawing?
must you be seesawing?
must they be seesawing? 	must I have seesawed?
must you have seesawed?
must he have seesawed?
must we have seesawed?
must you have seesawed?
must they have seesawed? 	must I have been seesawing?
must you have been seesawing?
must he have been seesawing?
must we have been seesawing?
must you have been seesawing?
must they have been seesawing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I seesaw?
mustn't you seesaw?
mustn't he seesaw?
mustn't we seesaw?
mustn't you seesaw?
mustn't they seesaw? 	mustn't I be seesawing?
mustn't you be seesawing?
mustn't he be seesawing?
mustn't we be seesawing?
mustn't you be seesawing?
mustn't they be seesawing? 	mustn't I have seesawed?
mustn't you have seesawed?
mustn't he have seesawed?
mustn't we have seesawed?
mustn't you have seesawed?
mustn't they have seesawed? 	mustn't I have been seesawing?
mustn't you have been seesawing?
mustn't he have been seesawing?
mustn't we have been seesawing?
mustn't you have been seesawing?
mustn't they have been seesawing?