I may butter you may butter he may butter we may butter you may butter they may butter
V-ing form
I may be buttering you may be buttering he may be buttering we may be buttering you may be buttering they may be buttering
Perfect
I may have buttered you may have buttered he may have buttered we may have buttered you may have buttered they may have buttered
V-ing perfect
I may have been buttering you may have been buttering he may have been buttering we may have been buttering you may have been buttering they may have been buttering
Negation
Simple form
I may not butter you may not butter he may not butter we may not butter you may not butter they may not butter
V-ing form
I may not be buttering you may not be buttering he may not be buttering we may not be buttering you may not be buttering they may not be buttering
Perfect
I may not have buttered you may not have buttered he may not have buttered we may not have buttered you may not have buttered they may not have buttered
V-ing perfect
I may not have been buttering you may not have been buttering he may not have been buttering we may not have been buttering you may not have been buttering they may not have been buttering
Interrogative form
Simple form
may I butter? may you butter? may he butter? may we butter? may you butter? may they butter?
V-ing form
may I be buttering? may you be buttering? may he be buttering? may we be buttering? may you be buttering? may they be buttering?
Perfect
may I have buttered? may you have buttered? may he have buttered? may we have buttered? may you have buttered? may they have buttered?
V-ing perfect
may I have been buttering? may you have been buttering? may he have been buttering? may we have been buttering? may you have been buttering? may they have been buttering?
Interro-negative form
Simple form
may I not butter? may you not butter? may he not butter? may we not butter? may you not butter? may they not butter?
V-ing form
may I not be buttering? may you not be buttering? may he not be buttering? may we not be buttering? may you not be buttering? may they not be buttering?
Perfect
may I not have buttered? may you not have buttered? may he not have buttered? may we not have buttered? may you not have buttered? may they not have buttered?
V-ing perfect
may I not have been buttering? may you not have been buttering? may he not have been buttering? may we not have been buttering? may you not have been buttering? may they not have been buttering?