I may concentrate you may concentrate he may concentrate we may concentrate you may concentrate they may concentrate
V-ing form
I may be concentrating you may be concentrating he may be concentrating we may be concentrating you may be concentrating they may be concentrating
Perfect
I may have concentrated you may have concentrated he may have concentrated we may have concentrated you may have concentrated they may have concentrated
V-ing perfect
I may have been concentrating you may have been concentrating he may have been concentrating we may have been concentrating you may have been concentrating they may have been concentrating
Negation
Simple form
I mayn't concentrate you mayn't concentrate he mayn't concentrate we mayn't concentrate you mayn't concentrate they mayn't concentrate
V-ing form
I mayn't be concentrating you mayn't be concentrating he mayn't be concentrating we mayn't be concentrating you mayn't be concentrating they mayn't be concentrating
Perfect
I mayn't have concentrated you mayn't have concentrated he mayn't have concentrated we mayn't have concentrated you mayn't have concentrated they mayn't have concentrated
V-ing perfect
I mayn't have been concentrating you mayn't have been concentrating he mayn't have been concentrating we mayn't have been concentrating you mayn't have been concentrating they mayn't have been concentrating
Interrogative form
Simple form
may I concentrate? may you concentrate? may he concentrate? may we concentrate? may you concentrate? may they concentrate?
V-ing form
may I be concentrating? may you be concentrating? may he be concentrating? may we be concentrating? may you be concentrating? may they be concentrating?
Perfect
may I have concentrated? may you have concentrated? may he have concentrated? may we have concentrated? may you have concentrated? may they have concentrated?
V-ing perfect
may I have been concentrating? may you have been concentrating? may he have been concentrating? may we have been concentrating? may you have been concentrating? may they have been concentrating?
Interro-negative form
Simple form
mayn't I concentrate? mayn't you concentrate? mayn't he concentrate? mayn't we concentrate? mayn't you concentrate? mayn't they concentrate?
V-ing form
mayn't I be concentrating? mayn't you be concentrating? mayn't he be concentrating? mayn't we be concentrating? mayn't you be concentrating? mayn't they be concentrating?
Perfect
mayn't I have concentrated? mayn't you have concentrated? mayn't he have concentrated? mayn't we have concentrated? mayn't you have concentrated? mayn't they have concentrated?
V-ing perfect
mayn't I have been concentrating? mayn't you have been concentrating? mayn't he have been concentrating? mayn't we have been concentrating? mayn't you have been concentrating? mayn't they have been concentrating?