I may cross you may cross he may cross we may cross you may cross they may cross
V-ing form
I may be crossing you may be crossing he may be crossing we may be crossing you may be crossing they may be crossing
Perfect
I may have crossed you may have crossed he may have crossed we may have crossed you may have crossed they may have crossed
V-ing perfect
I may have been crossing you may have been crossing he may have been crossing we may have been crossing you may have been crossing they may have been crossing
Negation
Simple form
I may not cross you may not cross he may not cross we may not cross you may not cross they may not cross
V-ing form
I may not be crossing you may not be crossing he may not be crossing we may not be crossing you may not be crossing they may not be crossing
Perfect
I may not have crossed you may not have crossed he may not have crossed we may not have crossed you may not have crossed they may not have crossed
V-ing perfect
I may not have been crossing you may not have been crossing he may not have been crossing we may not have been crossing you may not have been crossing they may not have been crossing
Interrogative form
Simple form
may I cross? may you cross? may he cross? may we cross? may you cross? may they cross?
V-ing form
may I be crossing? may you be crossing? may he be crossing? may we be crossing? may you be crossing? may they be crossing?
Perfect
may I have crossed? may you have crossed? may he have crossed? may we have crossed? may you have crossed? may they have crossed?
V-ing perfect
may I have been crossing? may you have been crossing? may he have been crossing? may we have been crossing? may you have been crossing? may they have been crossing?
Interro-negative form
Simple form
may I not cross? may you not cross? may he not cross? may we not cross? may you not cross? may they not cross?
V-ing form
may I not be crossing? may you not be crossing? may he not be crossing? may we not be crossing? may you not be crossing? may they not be crossing?
Perfect
may I not have crossed? may you not have crossed? may he not have crossed? may we not have crossed? may you not have crossed? may they not have crossed?
V-ing perfect
may I not have been crossing? may you not have been crossing? may he not have been crossing? may we not have been crossing? may you not have been crossing? may they not have been crossing?