must explain
Verbo regular: explain - explained- explained

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must explain
you must explain
he must explain
we must explain
you must explain
they must explain 	I must be explaining
you must be explaining
he must be explaining
we must be explaining
you must be explaining
they must be explaining	I must have explained
you must have explained
he must have explained
we must have explained
you must have explained
they must have explained	I must have been explaining
you must have been explaining
he must have been explaining
we must have been explaining
you must have been explaining
they must have been explaining	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not explain
you must not explain
he must not explain
we must not explain
you must not explain
they must not explain 	I must not be explaining
you must not be explaining
he must not be explaining
we must not be explaining
you must not be explaining
they must not be explaining	I must not have explained
you must not have explained
he must not have explained
we must not have explained
you must not have explained
they must not have explained	I must not have been explaining
you must not have been explaining
he must not have been explaining
we must not have been explaining
you must not have been explaining
they must not have been explaining	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I explain?
must you explain?
must he explain?
must we explain?
must you explain?
must they explain? 	must I be explaining?
must you be explaining?
must he be explaining?
must we be explaining?
must you be explaining?
must they be explaining? 	must I have explained?
must you have explained?
must he have explained?
must we have explained?
must you have explained?
must they have explained? 	must I have been explaining?
must you have been explaining?
must he have been explaining?
must we have been explaining?
must you have been explaining?
must they have been explaining? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not explain?
must you not explain?
must he not explain?
must we not explain?
must you not explain?
must they not explain? 	must I not be explaining?
must you not be explaining?
must he not be explaining?
must we not be explaining?
must you not be explaining?
must they not be explaining? 	must I not have explained?
must you not have explained?
must he not have explained?
must we not have explained?
must you not have explained?
must they not have explained? 	must I not have been explaining?
must you not have been explaining?
must he not have been explaining?
must we not have been explaining?
must you not have been explaining?
must they not have been explaining?