ought to preinvestigate
Regular verb: preinvestigate - preinvestigated- preinvestigated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to preinvestigate
you ought to preinvestigate
he ought to preinvestigate
we ought to preinvestigate
you ought to preinvestigate
they ought to preinvestigate 	I ought to be preinvestigating
you ought to be preinvestigating
he ought to be preinvestigating
we ought to be preinvestigating
you ought to be preinvestigating
they ought to be preinvestigating	I ought to have preinvestigated
you ought to have preinvestigated
he ought to have preinvestigated
we ought to have preinvestigated
you ought to have preinvestigated
they ought to have preinvestigated	I ought to have been preinvestigating
you ought to have been preinvestigating
he ought to have been preinvestigating
we ought to have been preinvestigating
you ought to have been preinvestigating
they ought to have been preinvestigating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought not to preinvestigate
you ought not to preinvestigate
he ought not to preinvestigate
we ought not to preinvestigate
you ought not to preinvestigate
they ought not to preinvestigate 	I ought not to preinvestigating
you ought not to preinvestigating
he ought not to preinvestigating
we ought not to preinvestigating
you ought not to preinvestigating
they ought not to preinvestigating	I ought not to have preinvestigated
you ought not to have preinvestigated
he ought not to have preinvestigated
we ought not to have preinvestigated
you ought not to have preinvestigated
they ought not to have preinvestigated	I ought not to have been preinvestigating
you ought not to have been preinvestigating
he ought not to have been preinvestigating
we ought not to have been preinvestigating
you ought not to have been preinvestigating
they ought not to have been preinvestigating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I preinvestigate?
ought to you preinvestigate?
ought to he preinvestigate?
ought to we preinvestigate?
ought to you preinvestigate?
ought to they preinvestigate? 	ought to I be preinvestigating?
ought to you be preinvestigating?
ought to he be preinvestigating?
ought to we be preinvestigating?
ought to you be preinvestigating?
ought to they be preinvestigating? 	ought to I have preinvestigated?
ought to you have preinvestigated?
ought to he have preinvestigated?
ought to we have preinvestigated?
ought to you have preinvestigated?
ought to they have preinvestigated? 	ought to I have been preinvestigating?
ought to you have been preinvestigating?
ought to he have been preinvestigating?
ought to we have been preinvestigating?
ought to you have been preinvestigating?
ought to they have been preinvestigating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought I not to preinvestigate?
ought you not to preinvestigate?
ought he not to preinvestigate?
ought we not to preinvestigate?
ought you not to preinvestigate?
ought they not to preinvestigate? 	ought I not to be preinvestigating?
ought you not to be preinvestigating?
ought he not to be preinvestigating?
ought we not to be preinvestigating?
ought you not to be preinvestigating?
ought they not to be preinvestigating? 	ought I not to have preinvestigated?
ought you not to have preinvestigated?
ought he not to have preinvestigated?
ought we not to have preinvestigated?
ought you not to have preinvestigated?
ought they not to have preinvestigated? 	ought I not to have been preinvestigating?
ought you not to have been preinvestigating?
ought he not to have been preinvestigating?
ought we not to have been preinvestigating?
ought you not to have been preinvestigating?
ought they not to have been preinvestigating?