must chat
Verbo regular: chat - chatted- chatted

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must chat
you must chat
he must chat
we must chat
you must chat
they must chat 	I must be chatting
you must be chatting
he must be chatting
we must be chatting
you must be chatting
they must be chatting	I must have chatted
you must have chatted
he must have chatted
we must have chatted
you must have chatted
they must have chatted	I must have been chatting
you must have been chatting
he must have been chatting
we must have been chatting
you must have been chatting
they must have been chatting	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't chat
you mustn't chat
he mustn't chat
we mustn't chat
you mustn't chat
they mustn't chat 	I mustn't be chatting
you mustn't be chatting
he mustn't be chatting
we mustn't be chatting
you mustn't be chatting
they mustn't be chatting	I mustn't have chatted
you mustn't have chatted
he mustn't have chatted
we mustn't have chatted
you mustn't have chatted
they mustn't have chatted	I mustn't have been chatting
you mustn't have been chatting
he mustn't have been chatting
we mustn't have been chatting
you mustn't have been chatting
they mustn't have been chatting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I chat?
must you chat?
must he chat?
must we chat?
must you chat?
must they chat? 	must I be chatting?
must you be chatting?
must he be chatting?
must we be chatting?
must you be chatting?
must they be chatting? 	must I have chatted?
must you have chatted?
must he have chatted?
must we have chatted?
must you have chatted?
must they have chatted? 	must I have been chatting?
must you have been chatting?
must he have been chatting?
must we have been chatting?
must you have been chatting?
must they have been chatting? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I chat?
mustn't you chat?
mustn't he chat?
mustn't we chat?
mustn't you chat?
mustn't they chat? 	mustn't I be chatting?
mustn't you be chatting?
mustn't he be chatting?
mustn't we be chatting?
mustn't you be chatting?
mustn't they be chatting? 	mustn't I have chatted?
mustn't you have chatted?
mustn't he have chatted?
mustn't we have chatted?
mustn't you have chatted?
mustn't they have chatted? 	mustn't I have been chatting?
mustn't you have been chatting?
mustn't he have been chatting?
mustn't we have been chatting?
mustn't you have been chatting?
mustn't they have been chatting?