English verb conjugation COULD GRADE

Regular verb: grade - graded - graded

Affirmation

Simple form

I could grade
you could grade
he could grade
we could grade
you could grade
they could grade

V-ing form

I could be grading
you could be grading
he could be grading
we could be grading
you could be grading
they could be grading

Perfect

I could have graded
you could have graded
he could have graded
we could have graded
you could have graded
they could have graded

V-ing perfect

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

Negation

Simple form

I couldn't grade
you couldn't grade
he couldn't grade
we couldn't grade
you couldn't grade
they couldn't grade

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I grade?
could you grade?
could he grade?
could we grade?
could you grade?
could they grade?

V-ing form

could I be grading?
could you be grading?
could he be grading?
could we be grading?
could you be grading?
could they be grading?

Perfect

could I have graded?
could you have graded?
could he have graded?
could we have graded?
could you have graded?
could they have graded?

V-ing perfect

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?

Interro-negative form

Simple form

couldn't I grade?
couldn't you grade?
couldn't he grade?
couldn't we grade?
couldn't you grade?
couldn't they grade?

V-ing form

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?

Perfect

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?

V-ing perfect

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?

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