English verb conjugation
CAN GRADE

Regular verb: grade - graded - graded

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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