could eyewitness
Regular verb: eyewitness - eyewitnessed- eyewitnessed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could eyewitness
you could eyewitness
he could eyewitness
we could eyewitness
you could eyewitness
they could eyewitness 	I could be eyewitnessing
you could be eyewitnessing
he could be eyewitnessing
we could be eyewitnessing
you could be eyewitnessing
they could be eyewitnessing	I could have eyewitnessed
you could have eyewitnessed
he could have eyewitnessed
we could have eyewitnessed
you could have eyewitnessed
they could have eyewitnessed	I could have been eyewitnessing
you could have been eyewitnessing
he could have been eyewitnessing
we could have been eyewitnessing
you could have been eyewitnessing
they could have been eyewitnessing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not eyewitness
you could not eyewitness
he could not eyewitness
we could not eyewitness
you could not eyewitness
they could not eyewitness 	I could not be eyewitnessing
you could not be eyewitnessing
he could not be eyewitnessing
we could not be eyewitnessing
you could not be eyewitnessing
they could not be eyewitnessing	I could not have eyewitnessed
you could not have eyewitnessed
he could not have eyewitnessed
we could not have eyewitnessed
you could not have eyewitnessed
they could not have eyewitnessed	I could not have been eyewitnessing
you could not have been eyewitnessing
he could not have been eyewitnessing
we could not have been eyewitnessing
you could not have been eyewitnessing
they could not have been eyewitnessing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I eyewitness?
could you eyewitness?
could he eyewitness?
could we eyewitness?
could you eyewitness?
could they eyewitness? 	could I be eyewitnessing?
could you be eyewitnessing?
could he be eyewitnessing?
could we be eyewitnessing?
could you be eyewitnessing?
could they be eyewitnessing? 	could I have eyewitnessed?
could you have eyewitnessed?
could he have eyewitnessed?
could we have eyewitnessed?
could you have eyewitnessed?
could they have eyewitnessed? 	could I have been eyewitnessing?
could you have been eyewitnessing?
could he have been eyewitnessing?
could we have been eyewitnessing?
could you have been eyewitnessing?
could they have been eyewitnessing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not eyewitness?
could you not eyewitness?
could he not eyewitness?
could we not eyewitness?
could you not eyewitness?
could they not eyewitness? 	could I not be eyewitnessing?
could you not be eyewitnessing?
could he not be eyewitnessing?
could we not be eyewitnessing?
could you not be eyewitnessing?
could they not be eyewitnessing? 	could I not have eyewitnessed?
could you not have eyewitnessed?
could he not have eyewitnessed?
could we not have eyewitnessed?
could you not have eyewitnessed?
could they not have eyewitnessed? 	could I not have been eyewitnessing?
could you not have been eyewitnessing?
could he not have been eyewitnessing?
could we not have been eyewitnessing?
could you not have been eyewitnessing?
could they not have been eyewitnessing?