must grade
Verbo regular: grade - graded- graded

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must grade
you must grade
he must grade
we must grade
you must grade
they must grade 	I must be grading
you must be grading
he must be grading
we must be grading
you must be grading
they must be grading	I must have graded
you must have graded
he must have graded
we must have graded
you must have graded
they must have graded	I must have been grading
you must have been grading
he must have been grading
we must have been grading
you must have been grading
they must have been grading	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not grade
you must not grade
he must not grade
we must not grade
you must not grade
they must not grade 	I must not be grading
you must not be grading
he must not be grading
we must not be grading
you must not be grading
they must not be grading	I must not have graded
you must not have graded
he must not have graded
we must not have graded
you must not have graded
they must not have graded	I must not have been grading
you must not have been grading
he must not have been grading
we must not have been grading
you must not have been grading
they must not have been grading	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I grade?
must you grade?
must he grade?
must we grade?
must you grade?
must they grade? 	must I be grading?
must you be grading?
must he be grading?
must we be grading?
must you be grading?
must they be grading? 	must I have graded?
must you have graded?
must he have graded?
must we have graded?
must you have graded?
must they have graded? 	must I have been grading?
must you have been grading?
must he have been grading?
must we have been grading?
must you have been grading?
must they have been grading? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not grade?
must you not grade?
must he not grade?
must we not grade?
must you not grade?
must they not grade? 	must I not be grading?
must you not be grading?
must he not be grading?
must we not be grading?
must you not be grading?
must they not be grading? 	must I not have graded?
must you not have graded?
must he not have graded?
must we not have graded?
must you not have graded?
must they not have graded? 	must I not have been grading?
must you not have been grading?
must he not have been grading?
must we not have been grading?
must you not have been grading?
must they not have been grading?