I may investigate you may investigate she may investigate we may investigate you may investigate they may investigate
V-ing form
I may be investigating you may be investigating she may be investigating we may be investigating you may be investigating they may be investigating
Perfect
I may have investigated you may have investigated she may have investigated we may have investigated you may have investigated they may have investigated
V-ing perfect
I may have been investigating you may have been investigating she may have been investigating we may have been investigating you may have been investigating they may have been investigating
Negation
Simple form
I may not investigate you may not investigate she may not investigate we may not investigate you may not investigate they may not investigate
V-ing form
I may not be investigating you may not be investigating she may not be investigating we may not be investigating you may not be investigating they may not be investigating
Perfect
I may not have investigated you may not have investigated she may not have investigated we may not have investigated you may not have investigated they may not have investigated
V-ing perfect
I may not have been investigating you may not have been investigating she may not have been investigating we may not have been investigating you may not have been investigating they may not have been investigating
Interrogative form
Simple form
may I investigate? may you investigate? may she investigate? may we investigate? may you investigate? may they investigate?
V-ing form
may I be investigating? may you be investigating? may she be investigating? may we be investigating? may you be investigating? may they be investigating?
Perfect
may I have investigated? may you have investigated? may she have investigated? may we have investigated? may you have investigated? may they have investigated?
V-ing perfect
may I have been investigating? may you have been investigating? may she have been investigating? may we have been investigating? may you have been investigating? may they have been investigating?
Interro-negative form
Simple form
may I not investigate? may you not investigate? may she not investigate? may we not investigate? may you not investigate? may they not investigate?
V-ing form
may I not be investigating? may you not be investigating? may she not be investigating? may we not be investigating? may you not be investigating? may they not be investigating?
Perfect
may I not have investigated? may you not have investigated? may she not have investigated? may we not have investigated? may you not have investigated? may they not have investigated?
V-ing perfect
may I not have been investigating? may you not have been investigating? may she not have been investigating? may we not have been investigating? may you not have been investigating? may they not have been investigating?