must descend
Verbo regular: descend - descended- descended

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must descend
you must descend
she must descend
we must descend
you must descend
they must descend 	I must be descending
you must be descending
she must be descending
we must be descending
you must be descending
they must be descending	I must have descended
you must have descended
she must have descended
we must have descended
you must have descended
they must have descended	I must have been descending
you must have been descending
she must have been descending
we must have been descending
you must have been descending
they must have been descending	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not descend
you must not descend
she must not descend
we must not descend
you must not descend
they must not descend 	I must not be descending
you must not be descending
she must not be descending
we must not be descending
you must not be descending
they must not be descending	I must not have descended
you must not have descended
she must not have descended
we must not have descended
you must not have descended
they must not have descended	I must not have been descending
you must not have been descending
she must not have been descending
we must not have been descending
you must not have been descending
they must not have been descending	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I descend?
must you descend?
must she descend?
must we descend?
must you descend?
must they descend? 	must I be descending?
must you be descending?
must she be descending?
must we be descending?
must you be descending?
must they be descending? 	must I have descended?
must you have descended?
must she have descended?
must we have descended?
must you have descended?
must they have descended? 	must I have been descending?
must you have been descending?
must she have been descending?
must we have been descending?
must you have been descending?
must they have been descending? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not descend?
must you not descend?
must she not descend?
must we not descend?
must you not descend?
must they not descend? 	must I not be descending?
must you not be descending?
must she not be descending?
must we not be descending?
must you not be descending?
must they not be descending? 	must I not have descended?
must you not have descended?
must she not have descended?
must we not have descended?
must you not have descended?
must they not have descended? 	must I not have been descending?
must you not have been descending?
must she not have been descending?
must we not have been descending?
must you not have been descending?
must they not have been descending?