could eyewitness
Regular verb: eyewitness - eyewitnessed- eyewitnessed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could eyewitness
you could eyewitness
she could eyewitness
we could eyewitness
you could eyewitness
they could eyewitness 	I could be eyewitnessing
you could be eyewitnessing
she could be eyewitnessing
we could be eyewitnessing
you could be eyewitnessing
they could be eyewitnessing	I could have eyewitnessed
you could have eyewitnessed
she 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
she 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 couldn't eyewitness
you couldn't eyewitness
she couldn't eyewitness
we couldn't eyewitness
you couldn't eyewitness
they couldn't eyewitness 	I couldn't be eyewitnessing
you couldn't be eyewitnessing
she couldn't be eyewitnessing
we couldn't be eyewitnessing
you couldn't be eyewitnessing
they couldn't be eyewitnessing	I couldn't have eyewitnessed
you couldn't have eyewitnessed
she couldn't have eyewitnessed
we couldn't have eyewitnessed
you couldn't have eyewitnessed
they couldn't have eyewitnessed	I couldn't have been eyewitnessing
you couldn't have been eyewitnessing
she couldn't have been eyewitnessing
we couldn't have been eyewitnessing
you couldn't have been eyewitnessing
they couldn't have been eyewitnessing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I eyewitness?
could you eyewitness?
could she eyewitness?
could we eyewitness?
could you eyewitness?
could they eyewitness? 	could I be eyewitnessing?
could you be eyewitnessing?
could she be eyewitnessing?
could we be eyewitnessing?
could you be eyewitnessing?
could they be eyewitnessing? 	could I have eyewitnessed?
could you have eyewitnessed?
could she 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 she 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 	
couldn't I eyewitness?
couldn't you eyewitness?
couldn't she eyewitness?
couldn't we eyewitness?
couldn't you eyewitness?
couldn't they eyewitness? 	couldn't I be eyewitnessing?
couldn't you be eyewitnessing?
couldn't she be eyewitnessing?
couldn't we be eyewitnessing?
couldn't you be eyewitnessing?
couldn't they be eyewitnessing? 	couldn't I have eyewitnessed?
couldn't you have eyewitnessed?
couldn't she have eyewitnessed?
couldn't we have eyewitnessed?
couldn't you have eyewitnessed?
couldn't they have eyewitnessed? 	couldn't I have been eyewitnessing?
couldn't you have been eyewitnessing?
couldn't she have been eyewitnessing?
couldn't we have been eyewitnessing?
couldn't you have been eyewitnessing?
couldn't they have been eyewitnessing?