must answer
Verbo regular: answer - answered- answered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must answer
you must answer
he must answer
we must answer
you must answer
they must answer 	I must be answering
you must be answering
he must be answering
we must be answering
you must be answering
they must be answering	I must have answered
you must have answered
he must have answered
we must have answered
you must have answered
they must have answered	I must have been answering
you must have been answering
he must have been answering
we must have been answering
you must have been answering
they must have been answering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not answer
you must not answer
he must not answer
we must not answer
you must not answer
they must not answer 	I must not be answering
you must not be answering
he must not be answering
we must not be answering
you must not be answering
they must not be answering	I must not have answered
you must not have answered
he must not have answered
we must not have answered
you must not have answered
they must not have answered	I must not have been answering
you must not have been answering
he must not have been answering
we must not have been answering
you must not have been answering
they must not have been answering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I answer?
must you answer?
must he answer?
must we answer?
must you answer?
must they answer? 	must I be answering?
must you be answering?
must he be answering?
must we be answering?
must you be answering?
must they be answering? 	must I have answered?
must you have answered?
must he have answered?
must we have answered?
must you have answered?
must they have answered? 	must I have been answering?
must you have been answering?
must he have been answering?
must we have been answering?
must you have been answering?
must they have been answering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not answer?
must you not answer?
must he not answer?
must we not answer?
must you not answer?
must they not answer? 	must I not be answering?
must you not be answering?
must he not be answering?
must we not be answering?
must you not be answering?
must they not be answering? 	must I not have answered?
must you not have answered?
must he not have answered?
must we not have answered?
must you not have answered?
must they not have answered? 	must I not have been answering?
must you not have been answering?
must he not have been answering?
must we not have been answering?
must you not have been answering?
must they not have been answering?