should grade
Verbo regular: grade - graded- graded

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

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

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

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