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 couldn't eyewitness you couldn't eyewitness he 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 he couldn't be eyewitnessing we couldn't be eyewitnessing you couldn't be eyewitnessing they couldn't be eyewitnessing
Perfect	V-ing perfect
I couldn't have eyewitnessed you couldn't have eyewitnessed he 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 he 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
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
couldn't I eyewitness? couldn't you eyewitness? couldn't he 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 he be eyewitnessing? couldn't we be eyewitnessing? couldn't you be eyewitnessing? couldn't they be eyewitnessing?
Perfect	V-ing perfect
couldn't I have eyewitnessed? couldn't you have eyewitnessed? couldn't he 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 he have been eyewitnessing? couldn't we have been eyewitnessing? couldn't you have been eyewitnessing? couldn't they have been eyewitnessing?