must respond
Verbo regular: respond - responded- responded

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must respond
you must respond
he must respond
we must respond
you must respond
they must respond 	I must be responding
you must be responding
he must be responding
we must be responding
you must be responding
they must be responding	I must have responded
you must have responded
he must have responded
we must have responded
you must have responded
they must have responded	I must have been responding
you must have been responding
he must have been responding
we must have been responding
you must have been responding
they must have been responding	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not respond
you must not respond
he must not respond
we must not respond
you must not respond
they must not respond 	I must not be responding
you must not be responding
he must not be responding
we must not be responding
you must not be responding
they must not be responding	I must not have responded
you must not have responded
he must not have responded
we must not have responded
you must not have responded
they must not have responded	I must not have been responding
you must not have been responding
he must not have been responding
we must not have been responding
you must not have been responding
they must not have been responding	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I respond?
must you respond?
must he respond?
must we respond?
must you respond?
must they respond? 	must I be responding?
must you be responding?
must he be responding?
must we be responding?
must you be responding?
must they be responding? 	must I have responded?
must you have responded?
must he have responded?
must we have responded?
must you have responded?
must they have responded? 	must I have been responding?
must you have been responding?
must he have been responding?
must we have been responding?
must you have been responding?
must they have been responding? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not respond?
must you not respond?
must he not respond?
must we not respond?
must you not respond?
must they not respond? 	must I not be responding?
must you not be responding?
must he not be responding?
must we not be responding?
must you not be responding?
must they not be responding? 	must I not have responded?
must you not have responded?
must he not have responded?
must we not have responded?
must you not have responded?
must they not have responded? 	must I not have been responding?
must you not have been responding?
must he not have been responding?
must we not have been responding?
must you not have been responding?
must they not have been responding?