English verb conjugation
COULD EYEWITNESS

Regular verb: eyewitness - eyewitnessed - eyewitnessed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?