must backstroke
Verbo regular: backstroke - backstroked- backstroked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must backstroke
you must backstroke
he must backstroke
we must backstroke
you must backstroke
they must backstroke 	I must be backstroking
you must be backstroking
he must be backstroking
we must be backstroking
you must be backstroking
they must be backstroking	I must have backstroked
you must have backstroked
he must have backstroked
we must have backstroked
you must have backstroked
they must have backstroked	I must have been backstroking
you must have been backstroking
he must have been backstroking
we must have been backstroking
you must have been backstroking
they must have been backstroking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't backstroke
you mustn't backstroke
he mustn't backstroke
we mustn't backstroke
you mustn't backstroke
they mustn't backstroke 	I mustn't be backstroking
you mustn't be backstroking
he mustn't be backstroking
we mustn't be backstroking
you mustn't be backstroking
they mustn't be backstroking	I mustn't have backstroked
you mustn't have backstroked
he mustn't have backstroked
we mustn't have backstroked
you mustn't have backstroked
they mustn't have backstroked	I mustn't have been backstroking
you mustn't have been backstroking
he mustn't have been backstroking
we mustn't have been backstroking
you mustn't have been backstroking
they mustn't have been backstroking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I backstroke?
must you backstroke?
must he backstroke?
must we backstroke?
must you backstroke?
must they backstroke? 	must I be backstroking?
must you be backstroking?
must he be backstroking?
must we be backstroking?
must you be backstroking?
must they be backstroking? 	must I have backstroked?
must you have backstroked?
must he have backstroked?
must we have backstroked?
must you have backstroked?
must they have backstroked? 	must I have been backstroking?
must you have been backstroking?
must he have been backstroking?
must we have been backstroking?
must you have been backstroking?
must they have been backstroking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I backstroke?
mustn't you backstroke?
mustn't he backstroke?
mustn't we backstroke?
mustn't you backstroke?
mustn't they backstroke? 	mustn't I be backstroking?
mustn't you be backstroking?
mustn't he be backstroking?
mustn't we be backstroking?
mustn't you be backstroking?
mustn't they be backstroking? 	mustn't I have backstroked?
mustn't you have backstroked?
mustn't he have backstroked?
mustn't we have backstroked?
mustn't you have backstroked?
mustn't they have backstroked? 	mustn't I have been backstroking?
mustn't you have been backstroking?
mustn't he have been backstroking?
mustn't we have been backstroking?
mustn't you have been backstroking?
mustn't they have been backstroking?