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 may not swallow you may not swallow he may not swallow we may not swallow you may not swallow they may not swallow
V-ing form
I may not be swallowing you may not be swallowing he may not be swallowing we may not be swallowing you may not be swallowing they may not be swallowing
Perfect
I may not have swallowed you may not have swallowed he may not have swallowed we may not have swallowed you may not have swallowed they may not have swallowed
V-ing perfect
I may not have been swallowing you may not have been swallowing he may not have been swallowing we may not have been swallowing you may not have been swallowing they may not 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
may I not swallow? may you not swallow? may he not swallow? may we not swallow? may you not swallow? may they not swallow?
V-ing form
may I not be swallowing? may you not be swallowing? may he not be swallowing? may we not be swallowing? may you not be swallowing? may they not be swallowing?
Perfect
may I not have swallowed? may you not have swallowed? may he not have swallowed? may we not have swallowed? may you not have swallowed? may they not have swallowed?
V-ing perfect
may I not have been swallowing? may you not have been swallowing? may he not have been swallowing? may we not have been swallowing? may you not have been swallowing? may they not have been swallowing?