should grade
Verbo regular: grade - graded- graded

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I'd grade
you'd grade
he'd grade
we'd grade
you'd grade
they'd grade 	I'd be grading
you'd be grading
he'd be grading
we'd be grading
you'd be grading
they'd be grading	I should've graded
you should've graded
he should've graded
we should've graded
you should've graded
they should've graded	I should've been grading
you should've been grading
he should've been grading
we should've been grading
you should've been grading
they should've been grading	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I shouldn't grade
you shouldn't grade
he shouldn't grade
we shouldn't grade
you shouldn't grade
they shouldn't grade 	I shouldn't be grading
you shouldn't be grading
he shouldn't be grading
we shouldn't be grading
you shouldn't be grading
they shouldn't be grading	I shouldn't have graded
you shouldn't have graded
he shouldn't have graded
we shouldn't have graded
you shouldn't have graded
they shouldn't have graded	I shouldn't have been grading
you shouldn't have been grading
he shouldn't have been grading
we shouldn't have been grading
you shouldn't have been grading
they shouldn't have been grading	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con 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-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
shouldn't I grade?
shouldn't you grade?
shouldn't he grade?
shouldn't we grade?
shouldn't you grade?
shouldn't they grade? 	shouldn't I be grading?
shouldn't you be grading?
shouldn't he be grading?
shouldn't we be grading?
shouldn't you be grading?
shouldn't they be grading? 	shouldn't I have graded?
shouldn't you have graded?
shouldn't he have graded?
shouldn't we have graded?
shouldn't you have graded?
shouldn't they have graded? 	shouldn't I have been grading?
shouldn't you have been grading?
shouldn't he have been grading?
shouldn't we have been grading?
shouldn't you have been grading?
shouldn't they have been grading?