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