must sit
Verbo irregular: sit - sat- sat

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must sit
you must sit
he must sit
we must sit
you must sit
they must sit 	I must be sitting
you must be sitting
he must be sitting
we must be sitting
you must be sitting
they must be sitting	I must have sat
you must have sat
he must have sat
we must have sat
you must have sat
they must have sat	I must have been sitting
you must have been sitting
he must have been sitting
we must have been sitting
you must have been sitting
they must have been sitting	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't sit
you mustn't sit
he mustn't sit
we mustn't sit
you mustn't sit
they mustn't sit 	I mustn't be sitting
you mustn't be sitting
he mustn't be sitting
we mustn't be sitting
you mustn't be sitting
they mustn't be sitting	I mustn't have sat
you mustn't have sat
he mustn't have sat
we mustn't have sat
you mustn't have sat
they mustn't have sat	I mustn't have been sitting
you mustn't have been sitting
he mustn't have been sitting
we mustn't have been sitting
you mustn't have been sitting
they mustn't have been sitting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I sit?
must you sit?
must he sit?
must we sit?
must you sit?
must they sit? 	must I be sitting?
must you be sitting?
must he be sitting?
must we be sitting?
must you be sitting?
must they be sitting? 	must I have sat?
must you have sat?
must he have sat?
must we have sat?
must you have sat?
must they have sat? 	must I have been sitting?
must you have been sitting?
must he have been sitting?
must we have been sitting?
must you have been sitting?
must they have been sitting? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I sit?
mustn't you sit?
mustn't he sit?
mustn't we sit?
mustn't you sit?
mustn't they sit? 	mustn't I be sitting?
mustn't you be sitting?
mustn't he be sitting?
mustn't we be sitting?
mustn't you be sitting?
mustn't they be sitting? 	mustn't I have sat?
mustn't you have sat?
mustn't he have sat?
mustn't we have sat?
mustn't you have sat?
mustn't they have sat? 	mustn't I have been sitting?
mustn't you have been sitting?
mustn't he have been sitting?
mustn't we have been sitting?
mustn't you have been sitting?
mustn't they have been sitting?