English verb conjugation
COULD HIGH-GRADE

Regular verb: high-grade - high-graded - high-graded

Affirmation

Simple form	V-ing form
I could high-grade you could high-grade he could high-grade we could high-grade you could high-grade they could high-grade	I could be high-grading you could be high-grading he could be high-grading we could be high-grading you could be high-grading they could be high-grading
Perfect	V-ing perfect
I could have high-graded you could have high-graded he could have high-graded we could have high-graded you could have high-graded they could have high-graded	I could have been high-grading you could have been high-grading he could have been high-grading we could have been high-grading you could have been high-grading they could have been high-grading

Negation

Simple form	V-ing form
I could not high-grade you could not high-grade he could not high-grade we could not high-grade you could not high-grade they could not high-grade	I could not be high-grading you could not be high-grading he could not be high-grading we could not be high-grading you could not be high-grading they could not be high-grading
Perfect	V-ing perfect
I could not have high-graded you could not have high-graded he could not have high-graded we could not have high-graded you could not have high-graded they could not have high-graded	I could not have been high-grading you could not have been high-grading he could not have been high-grading we could not have been high-grading you could not have been high-grading they could not have been high-grading

Interrogative form

Simple form	V-ing form
could I high-grade? could you high-grade? could he high-grade? could we high-grade? could you high-grade? could they high-grade?	could I be high-grading? could you be high-grading? could he be high-grading? could we be high-grading? could you be high-grading? could they be high-grading?
Perfect	V-ing perfect
could I have high-graded? could you have high-graded? could he have high-graded? could we have high-graded? could you have high-graded? could they have high-graded?	could I have been high-grading? could you have been high-grading? could he have been high-grading? could we have been high-grading? could you have been high-grading? could they have been high-grading?

Interro-negative form

Simple form	V-ing form
could I not high-grade? could you not high-grade? could he not high-grade? could we not high-grade? could you not high-grade? could they not high-grade?	could I not be high-grading? could you not be high-grading? could he not be high-grading? could we not be high-grading? could you not be high-grading? could they not be high-grading?
Perfect	V-ing perfect
could I not have high-graded? could you not have high-graded? could he not have high-graded? could we not have high-graded? could you not have high-graded? could they not have high-graded?	could I not have been high-grading? could you not have been high-grading? could he not have been high-grading? could we not have been high-grading? could you not have been high-grading? could they not have been high-grading?