must tremble
Verbo regular: tremble - trembled- trembled

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must tremble
you must tremble
he must tremble
we must tremble
you must tremble
they must tremble 	I must be trembling
you must be trembling
he must be trembling
we must be trembling
you must be trembling
they must be trembling	I must have trembled
you must have trembled
he must have trembled
we must have trembled
you must have trembled
they must have trembled	I must have been trembling
you must have been trembling
he must have been trembling
we must have been trembling
you must have been trembling
they must have been trembling	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't tremble
you mustn't tremble
he mustn't tremble
we mustn't tremble
you mustn't tremble
they mustn't tremble 	I mustn't be trembling
you mustn't be trembling
he mustn't be trembling
we mustn't be trembling
you mustn't be trembling
they mustn't be trembling	I mustn't have trembled
you mustn't have trembled
he mustn't have trembled
we mustn't have trembled
you mustn't have trembled
they mustn't have trembled	I mustn't have been trembling
you mustn't have been trembling
he mustn't have been trembling
we mustn't have been trembling
you mustn't have been trembling
they mustn't have been trembling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I tremble?
must you tremble?
must he tremble?
must we tremble?
must you tremble?
must they tremble? 	must I be trembling?
must you be trembling?
must he be trembling?
must we be trembling?
must you be trembling?
must they be trembling? 	must I have trembled?
must you have trembled?
must he have trembled?
must we have trembled?
must you have trembled?
must they have trembled? 	must I have been trembling?
must you have been trembling?
must he have been trembling?
must we have been trembling?
must you have been trembling?
must they have been trembling? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I tremble?
mustn't you tremble?
mustn't he tremble?
mustn't we tremble?
mustn't you tremble?
mustn't they tremble? 	mustn't I be trembling?
mustn't you be trembling?
mustn't he be trembling?
mustn't we be trembling?
mustn't you be trembling?
mustn't they be trembling? 	mustn't I have trembled?
mustn't you have trembled?
mustn't he have trembled?
mustn't we have trembled?
mustn't you have trembled?
mustn't they have trembled? 	mustn't I have been trembling?
mustn't you have been trembling?
mustn't he have been trembling?
mustn't we have been trembling?
mustn't you have been trembling?
mustn't they have been trembling?