I may grade you may grade she may grade we may grade you may grade they may grade
V-ing form
I may be grading you may be grading she may be grading we may be grading you may be grading they may be grading
Perfect
I may have graded you may have graded she may have graded we may have graded you may have graded they may have graded
V-ing perfect
I may have been grading you may have been grading she may have been grading we may have been grading you may have been grading they may have been grading
Negation
Simple form
I may not grade you may not grade she may not grade we may not grade you may not grade they may not grade
V-ing form
I may not be grading you may not be grading she may not be grading we may not be grading you may not be grading they may not be grading
Perfect
I may not have graded you may not have graded she may not have graded we may not have graded you may not have graded they may not have graded
V-ing perfect
I may not have been grading you may not have been grading she may not have been grading we may not have been grading you may not have been grading they may not have been grading
Interrogative form
Simple form
may I grade? may you grade? may she grade? may we grade? may you grade? may they grade?
V-ing form
may I be grading? may you be grading? may she be grading? may we be grading? may you be grading? may they be grading?
Perfect
may I have graded? may you have graded? may she have graded? may we have graded? may you have graded? may they have graded?
V-ing perfect
may I have been grading? may you have been grading? may she have been grading? may we have been grading? may you have been grading? may they have been grading?
Interro-negative form
Simple form
may I not grade? may you not grade? may she not grade? may we not grade? may you not grade? may they not grade?
V-ing form
may I not be grading? may you not be grading? may she not be grading? may we not be grading? may you not be grading? may they not be grading?
Perfect
may I not have graded? may you not have graded? may she not have graded? may we not have graded? may you not have graded? may they not have graded?
V-ing perfect
may I not have been grading? may you not have been grading? may she not have been grading? may we not have been grading? may you not have been grading? may they not have been grading?