may investigate
Regular verb: investigate - investigated- investigated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may investigate
you may investigate
she may investigate
we may investigate
you may investigate
they may investigate 	I may be investigating
you may be investigating
she may be investigating
we may be investigating
you may be investigating
they may be investigating	I may have investigated
you may have investigated
she may have investigated
we may have investigated
you may have investigated
they may have investigated	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 	V-ing form 	Perfect 	V-ing perfect 	
I may not investigate
you may not investigate
she may not investigate
we may not investigate
you may not investigate
they may not investigate 	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	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	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 	V-ing form 	Perfect 	V-ing perfect 	
may I investigate?
may you investigate?
may she investigate?
may we investigate?
may you investigate?
may they investigate? 	may I be investigating?
may you be investigating?
may she be investigating?
may we be investigating?
may you be investigating?
may they be investigating? 	may I have investigated?
may you have investigated?
may she have investigated?
may we have investigated?
may you have investigated?
may they have investigated? 	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 	V-ing form 	Perfect 	V-ing perfect 	
may I not investigate?
may you not investigate?
may she not investigate?
may we not investigate?
may you not investigate?
may they not investigate? 	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? 	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? 	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?