I may howl you may howl he may howl we may howl you may howl they may howl
V-ing form
I may be howling you may be howling he may be howling we may be howling you may be howling they may be howling
Perfect
I may have howled you may have howled he may have howled we may have howled you may have howled they may have howled
V-ing perfect
I may have been howling you may have been howling he may have been howling we may have been howling you may have been howling they may have been howling
Negation
Simple form
I may not howl you may not howl he may not howl we may not howl you may not howl they may not howl
V-ing form
I may not be howling you may not be howling he may not be howling we may not be howling you may not be howling they may not be howling
Perfect
I may not have howled you may not have howled he may not have howled we may not have howled you may not have howled they may not have howled
V-ing perfect
I may not have been howling you may not have been howling he may not have been howling we may not have been howling you may not have been howling they may not have been howling
Interrogative form
Simple form
may I howl? may you howl? may he howl? may we howl? may you howl? may they howl?
V-ing form
may I be howling? may you be howling? may he be howling? may we be howling? may you be howling? may they be howling?
Perfect
may I have howled? may you have howled? may he have howled? may we have howled? may you have howled? may they have howled?
V-ing perfect
may I have been howling? may you have been howling? may he have been howling? may we have been howling? may you have been howling? may they have been howling?
Interro-negative form
Simple form
may I not howl? may you not howl? may he not howl? may we not howl? may you not howl? may they not howl?
V-ing form
may I not be howling? may you not be howling? may he not be howling? may we not be howling? may you not be howling? may they not be howling?
Perfect
may I not have howled? may you not have howled? may he not have howled? may we not have howled? may you not have howled? may they not have howled?
V-ing perfect
may I not have been howling? may you not have been howling? may he not have been howling? may we not have been howling? may you not have been howling? may they not have been howling?