I may countersink you may countersink he may countersink we may countersink you may countersink they may countersink
V-ing form
I may be countersinking you may be countersinking he may be countersinking we may be countersinking you may be countersinking they may be countersinking
Perfect
I may have countersunk you may have countersunk he may have countersunk we may have countersunk you may have countersunk they may have countersunk
V-ing perfect
I may have been countersinking you may have been countersinking he may have been countersinking we may have been countersinking you may have been countersinking they may have been countersinking
Negation
Simple form
I may not countersink you may not countersink he may not countersink we may not countersink you may not countersink they may not countersink
V-ing form
I may not be countersinking you may not be countersinking he may not be countersinking we may not be countersinking you may not be countersinking they may not be countersinking
Perfect
I may not have countersunk you may not have countersunk he may not have countersunk we may not have countersunk you may not have countersunk they may not have countersunk
V-ing perfect
I may not have been countersinking you may not have been countersinking he may not have been countersinking we may not have been countersinking you may not have been countersinking they may not have been countersinking
Interrogative form
Simple form
may I countersink? may you countersink? may he countersink? may we countersink? may you countersink? may they countersink?
V-ing form
may I be countersinking? may you be countersinking? may he be countersinking? may we be countersinking? may you be countersinking? may they be countersinking?
Perfect
may I have countersunk? may you have countersunk? may he have countersunk? may we have countersunk? may you have countersunk? may they have countersunk?
V-ing perfect
may I have been countersinking? may you have been countersinking? may he have been countersinking? may we have been countersinking? may you have been countersinking? may they have been countersinking?
Interro-negative form
Simple form
may I not countersink? may you not countersink? may he not countersink? may we not countersink? may you not countersink? may they not countersink?
V-ing form
may I not be countersinking? may you not be countersinking? may he not be countersinking? may we not be countersinking? may you not be countersinking? may they not be countersinking?
Perfect
may I not have countersunk? may you not have countersunk? may he not have countersunk? may we not have countersunk? may you not have countersunk? may they not have countersunk?
V-ing perfect
may I not have been countersinking? may you not have been countersinking? may he not have been countersinking? may we not have been countersinking? may you not have been countersinking? may they not have been countersinking?