I may combine you may combine he may combine we may combine you may combine they may combine
V-ing form
I may be combining you may be combining he may be combining we may be combining you may be combining they may be combining
Perfect
I may have combined you may have combined he may have combined we may have combined you may have combined they may have combined
V-ing perfect
I may have been combining you may have been combining he may have been combining we may have been combining you may have been combining they may have been combining
Negation
Simple form
I may not combine you may not combine he may not combine we may not combine you may not combine they may not combine
V-ing form
I may not be combining you may not be combining he may not be combining we may not be combining you may not be combining they may not be combining
Perfect
I may not have combined you may not have combined he may not have combined we may not have combined you may not have combined they may not have combined
V-ing perfect
I may not have been combining you may not have been combining he may not have been combining we may not have been combining you may not have been combining they may not have been combining
Interrogative form
Simple form
may I combine? may you combine? may he combine? may we combine? may you combine? may they combine?
V-ing form
may I be combining? may you be combining? may he be combining? may we be combining? may you be combining? may they be combining?
Perfect
may I have combined? may you have combined? may he have combined? may we have combined? may you have combined? may they have combined?
V-ing perfect
may I have been combining? may you have been combining? may he have been combining? may we have been combining? may you have been combining? may they have been combining?
Interro-negative form
Simple form
may I not combine? may you not combine? may he not combine? may we not combine? may you not combine? may they not combine?
V-ing form
may I not be combining? may you not be combining? may he not be combining? may we not be combining? may you not be combining? may they not be combining?
Perfect
may I not have combined? may you not have combined? may he not have combined? may we not have combined? may you not have combined? may they not have combined?
V-ing perfect
may I not have been combining? may you not have been combining? may he not have been combining? may we not have been combining? may you not have been combining? may they not have been combining?