could reinvestigate
Regular verb: reinvestigate - reinvestigated- reinvestigated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could reinvestigate
you could reinvestigate
he could reinvestigate
we could reinvestigate
you could reinvestigate
they could reinvestigate 	I could be reinvestigating
you could be reinvestigating
he could be reinvestigating
we could be reinvestigating
you could be reinvestigating
they could be reinvestigating	I could have reinvestigated
you could have reinvestigated
he could have reinvestigated
we could have reinvestigated
you could have reinvestigated
they could have reinvestigated	I could have been reinvestigating
you could have been reinvestigating
he could have been reinvestigating
we could have been reinvestigating
you could have been reinvestigating
they could have been reinvestigating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not reinvestigate
you could not reinvestigate
he could not reinvestigate
we could not reinvestigate
you could not reinvestigate
they could not reinvestigate 	I could not be reinvestigating
you could not be reinvestigating
he could not be reinvestigating
we could not be reinvestigating
you could not be reinvestigating
they could not be reinvestigating	I could not have reinvestigated
you could not have reinvestigated
he could not have reinvestigated
we could not have reinvestigated
you could not have reinvestigated
they could not have reinvestigated	I could not have been reinvestigating
you could not have been reinvestigating
he could not have been reinvestigating
we could not have been reinvestigating
you could not have been reinvestigating
they could not have been reinvestigating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I reinvestigate?
could you reinvestigate?
could he reinvestigate?
could we reinvestigate?
could you reinvestigate?
could they reinvestigate? 	could I be reinvestigating?
could you be reinvestigating?
could he be reinvestigating?
could we be reinvestigating?
could you be reinvestigating?
could they be reinvestigating? 	could I have reinvestigated?
could you have reinvestigated?
could he have reinvestigated?
could we have reinvestigated?
could you have reinvestigated?
could they have reinvestigated? 	could I have been reinvestigating?
could you have been reinvestigating?
could he have been reinvestigating?
could we have been reinvestigating?
could you have been reinvestigating?
could they have been reinvestigating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not reinvestigate?
could you not reinvestigate?
could he not reinvestigate?
could we not reinvestigate?
could you not reinvestigate?
could they not reinvestigate? 	could I not be reinvestigating?
could you not be reinvestigating?
could he not be reinvestigating?
could we not be reinvestigating?
could you not be reinvestigating?
could they not be reinvestigating? 	could I not have reinvestigated?
could you not have reinvestigated?
could he not have reinvestigated?
could we not have reinvestigated?
could you not have reinvestigated?
could they not have reinvestigated? 	could I not have been reinvestigating?
could you not have been reinvestigating?
could he not have been reinvestigating?
could we not have been reinvestigating?
could you not have been reinvestigating?
could they not have been reinvestigating?