must sing
Verbo irregular: sing - sang- sung

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must sing
you must sing
she must sing
we must sing
you must sing
they must sing 	I must be singing
you must be singing
she must be singing
we must be singing
you must be singing
they must be singing	I must have sung
you must have sung
she must have sung
we must have sung
you must have sung
they must have sung	I must have been singing
you must have been singing
she must have been singing
we must have been singing
you must have been singing
they must have been singing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not sing
you must not sing
she must not sing
we must not sing
you must not sing
they must not sing 	I must not be singing
you must not be singing
she must not be singing
we must not be singing
you must not be singing
they must not be singing	I must not have sung
you must not have sung
she must not have sung
we must not have sung
you must not have sung
they must not have sung	I must not have been singing
you must not have been singing
she must not have been singing
we must not have been singing
you must not have been singing
they must not have been singing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I sing?
must you sing?
must she sing?
must we sing?
must you sing?
must they sing? 	must I be singing?
must you be singing?
must she be singing?
must we be singing?
must you be singing?
must they be singing? 	must I have sung?
must you have sung?
must she have sung?
must we have sung?
must you have sung?
must they have sung? 	must I have been singing?
must you have been singing?
must she have been singing?
must we have been singing?
must you have been singing?
must they have been singing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not sing?
must you not sing?
must she not sing?
must we not sing?
must you not sing?
must they not sing? 	must I not be singing?
must you not be singing?
must she not be singing?
must we not be singing?
must you not be singing?
must they not be singing? 	must I not have sung?
must you not have sung?
must she not have sung?
must we not have sung?
must you not have sung?
must they not have sung? 	must I not have been singing?
must you not have been singing?
must she not have been singing?
must we not have been singing?
must you not have been singing?
must they not have been singing?