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