ought to investigate
Regular verb: investigate - investigated- investigated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to investigate
you ought to investigate
she ought to investigate
we ought to investigate
you ought to investigate
they ought to investigate 	I ought to be investigating
you ought to be investigating
she ought to be investigating
we ought to be investigating
you ought to be investigating
they ought to be investigating	I ought to have investigated
you ought to have investigated
she ought to have investigated
we ought to have investigated
you ought to have investigated
they ought to have investigated	I ought to have been investigating
you ought to have been investigating
she ought to have been investigating
we ought to have been investigating
you ought to have been investigating
they ought to have been investigating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought not to investigate
you ought not to investigate
she ought not to investigate
we ought not to investigate
you ought not to investigate
they ought not to investigate 	I ought not to investigating
you ought not to investigating
she ought not to investigating
we ought not to investigating
you ought not to investigating
they ought not to investigating	I ought not to have investigated
you ought not to have investigated
she ought not to have investigated
we ought not to have investigated
you ought not to have investigated
they ought not to have investigated	I ought not to have been investigating
you ought not to have been investigating
she ought not to have been investigating
we ought not to have been investigating
you ought not to have been investigating
they ought not to have been investigating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I investigate?
ought to you investigate?
ought to she investigate?
ought to we investigate?
ought to you investigate?
ought to they investigate? 	ought to I be investigating?
ought to you be investigating?
ought to she be investigating?
ought to we be investigating?
ought to you be investigating?
ought to they be investigating? 	ought to I have investigated?
ought to you have investigated?
ought to she have investigated?
ought to we have investigated?
ought to you have investigated?
ought to they have investigated? 	ought to I have been investigating?
ought to you have been investigating?
ought to she have been investigating?
ought to we have been investigating?
ought to you have been investigating?
ought to they have been investigating? 	

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