Conjugação do verbo inglês
COULD GRADE

Verbo regular: grade - graded - graded

Afirmação

Forma simple	Forma com 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
Perfeito	Perfeito com V-ing
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

Negação

Forma simple	Forma com 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
Perfeito	Perfeito com V-ing
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 simple	Forma com 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?
Perfeito	Perfeito com V-ing
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-Negação

Forma simple	Forma com 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?
Perfeito	Perfeito com V-ing
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?