could witness
Verbe régulier : witness - witnessed- witnessed
Traduction française : être témoin de - témoigner 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could witness
you could witness
she could witness
we could witness
you could witness
they could witness 	I could be witnessing
you could be witnessing
she could be witnessing
we could be witnessing
you could be witnessing
they could be witnessing	I could have witnessed
you could have witnessed
she could have witnessed
we could have witnessed
you could have witnessed
they could have witnessed	I could have been witnessing
you could have been witnessing
she could have been witnessing
we could have been witnessing
you could have been witnessing
they could have been witnessing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could not witness
you could not witness
she could not witness
we could not witness
you could not witness
they could not witness 	I could not be witnessing
you could not be witnessing
she could not be witnessing
we could not be witnessing
you could not be witnessing
they could not be witnessing	I could not have witnessed
you could not have witnessed
she could not have witnessed
we could not have witnessed
you could not have witnessed
they could not have witnessed	I could not have been witnessing
you could not have been witnessing
she could not have been witnessing
we could not have been witnessing
you could not have been witnessing
they could not have been witnessing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I witness?
could you witness?
could she witness?
could we witness?
could you witness?
could they witness? 	could I be witnessing?
could you be witnessing?
could she be witnessing?
could we be witnessing?
could you be witnessing?
could they be witnessing? 	could I have witnessed?
could you have witnessed?
could she have witnessed?
could we have witnessed?
could you have witnessed?
could they have witnessed? 	could I have been witnessing?
could you have been witnessing?
could she have been witnessing?
could we have been witnessing?
could you have been witnessing?
could they have been witnessing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I not witness?
could you not witness?
could she not witness?
could we not witness?
could you not witness?
could they not witness? 	could I not be witnessing?
could you not be witnessing?
could she not be witnessing?
could we not be witnessing?
could you not be witnessing?
could they not be witnessing? 	could I not have witnessed?
could you not have witnessed?
could she not have witnessed?
could we not have witnessed?
could you not have witnessed?
could they not have witnessed? 	could I not have been witnessing?
could you not have been witnessing?
could she not have been witnessing?
could we not have been witnessing?
could you not have been witnessing?
could they not have been witnessing?