could grade
Verbo regolare: grade - graded- graded

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could grade
you could grade
he could grade
we could grade
you could grade
they could grade 	I could be grading
you could be grading
he could be grading
we could be grading
you could be grading
they could be grading	I could have graded
you could have graded
he could have graded
we could have graded
you could have graded
they could have graded	I could have been grading
you could have been grading
he could have been grading
we could have been grading
you could have been grading
they could have been grading	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I couldn't grade
you couldn't grade
he couldn't grade
we couldn't grade
you couldn't grade
they couldn't grade 	I couldn't be grading
you couldn't be grading
he couldn't be grading
we couldn't be grading
you couldn't be grading
they couldn't be grading	I couldn't have graded
you couldn't have graded
he couldn't have graded
we couldn't have graded
you couldn't have graded
they couldn't have graded	I couldn't have been grading
you couldn't have been grading
he couldn't have been grading
we couldn't have been grading
you couldn't have been grading
they couldn't have been grading	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I grade?
could you grade?
could he grade?
could we grade?
could you grade?
could they grade? 	could I be grading?
could you be grading?
could he be grading?
could we be grading?
could you be grading?
could they be grading? 	could I have graded?
could you have graded?
could he have graded?
could we have graded?
could you have graded?
could they have graded? 	could I have been grading?
could you have been grading?
could he have been grading?
could we have been grading?
could you have been grading?
could they have been grading? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
couldn't I grade?
couldn't you grade?
couldn't he grade?
couldn't we grade?
couldn't you grade?
couldn't they grade? 	couldn't I be grading?
couldn't you be grading?
couldn't he be grading?
couldn't we be grading?
couldn't you be grading?
couldn't they be grading? 	couldn't I have graded?
couldn't you have graded?
couldn't he have graded?
couldn't we have graded?
couldn't you have graded?
couldn't they have graded? 	couldn't I have been grading?
couldn't you have been grading?
couldn't he have been grading?
couldn't we have been grading?
couldn't you have been grading?
couldn't they have been grading?