I may check you may check she may check we may check you may check they may check
V-ing form
I may be checking you may be checking she may be checking we may be checking you may be checking they may be checking
Perfect
I may have checked you may have checked she may have checked we may have checked you may have checked they may have checked
V-ing perfect
I may have been checking you may have been checking she may have been checking we may have been checking you may have been checking they may have been checking
Negation
Simple form
I may not check you may not check she may not check we may not check you may not check they may not check
V-ing form
I may not be checking you may not be checking she may not be checking we may not be checking you may not be checking they may not be checking
Perfect
I may not have checked you may not have checked she may not have checked we may not have checked you may not have checked they may not have checked
V-ing perfect
I may not have been checking you may not have been checking she may not have been checking we may not have been checking you may not have been checking they may not have been checking
Interrogative form
Simple form
may I check? may you check? may she check? may we check? may you check? may they check?
V-ing form
may I be checking? may you be checking? may she be checking? may we be checking? may you be checking? may they be checking?
Perfect
may I have checked? may you have checked? may she have checked? may we have checked? may you have checked? may they have checked?
V-ing perfect
may I have been checking? may you have been checking? may she have been checking? may we have been checking? may you have been checking? may they have been checking?
Interro-negative form
Simple form
may I not check? may you not check? may she not check? may we not check? may you not check? may they not check?
V-ing form
may I not be checking? may you not be checking? may she not be checking? may we not be checking? may you not be checking? may they not be checking?
Perfect
may I not have checked? may you not have checked? may she not have checked? may we not have checked? may you not have checked? may they not have checked?
V-ing perfect
may I not have been checking? may you not have been checking? may she not have been checking? may we not have been checking? may you not have been checking? may they not have been checking?