must screw
Verbo regular: screw - screwed- screwed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must screw
you must screw
he must screw
we must screw
you must screw
they must screw 	I must be screwing
you must be screwing
he must be screwing
we must be screwing
you must be screwing
they must be screwing	I must have screwed
you must have screwed
he must have screwed
we must have screwed
you must have screwed
they must have screwed	I must have been screwing
you must have been screwing
he must have been screwing
we must have been screwing
you must have been screwing
they must have been screwing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't screw
you mustn't screw
he mustn't screw
we mustn't screw
you mustn't screw
they mustn't screw 	I mustn't be screwing
you mustn't be screwing
he mustn't be screwing
we mustn't be screwing
you mustn't be screwing
they mustn't be screwing	I mustn't have screwed
you mustn't have screwed
he mustn't have screwed
we mustn't have screwed
you mustn't have screwed
they mustn't have screwed	I mustn't have been screwing
you mustn't have been screwing
he mustn't have been screwing
we mustn't have been screwing
you mustn't have been screwing
they mustn't have been screwing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I screw?
must you screw?
must he screw?
must we screw?
must you screw?
must they screw? 	must I be screwing?
must you be screwing?
must he be screwing?
must we be screwing?
must you be screwing?
must they be screwing? 	must I have screwed?
must you have screwed?
must he have screwed?
must we have screwed?
must you have screwed?
must they have screwed? 	must I have been screwing?
must you have been screwing?
must he have been screwing?
must we have been screwing?
must you have been screwing?
must they have been screwing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I screw?
mustn't you screw?
mustn't he screw?
mustn't we screw?
mustn't you screw?
mustn't they screw? 	mustn't I be screwing?
mustn't you be screwing?
mustn't he be screwing?
mustn't we be screwing?
mustn't you be screwing?
mustn't they be screwing? 	mustn't I have screwed?
mustn't you have screwed?
mustn't he have screwed?
mustn't we have screwed?
mustn't you have screwed?
mustn't they have screwed? 	mustn't I have been screwing?
mustn't you have been screwing?
mustn't he have been screwing?
mustn't we have been screwing?
mustn't you have been screwing?
mustn't they have been screwing?