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
he could witness
we could witness
you could witness
they could witness 	I could be witnessing
you could be witnessing
he could be witnessing
we could be witnessing
you could be witnessing
they could be witnessing	I could have witnessed
you could have witnessed
he 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
he 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 couldn't witness
you couldn't witness
he couldn't witness
we couldn't witness
you couldn't witness
they couldn't witness 	I couldn't be witnessing
you couldn't be witnessing
he couldn't be witnessing
we couldn't be witnessing
you couldn't be witnessing
they couldn't be witnessing	I couldn't have witnessed
you couldn't have witnessed
he couldn't have witnessed
we couldn't have witnessed
you couldn't have witnessed
they couldn't have witnessed	I couldn't have been witnessing
you couldn't have been witnessing
he couldn't have been witnessing
we couldn't have been witnessing
you couldn't have been witnessing
they couldn't have been witnessing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I witness?
could you witness?
could he witness?
could we witness?
could you witness?
could they witness? 	could I be witnessing?
could you be witnessing?
could he be witnessing?
could we be witnessing?
could you be witnessing?
could they be witnessing? 	could I have witnessed?
could you have witnessed?
could he 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 he 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 	
couldn't I witness?
couldn't you witness?
couldn't he witness?
couldn't we witness?
couldn't you witness?
couldn't they witness? 	couldn't I be witnessing?
couldn't you be witnessing?
couldn't he be witnessing?
couldn't we be witnessing?
couldn't you be witnessing?
couldn't they be witnessing? 	couldn't I have witnessed?
couldn't you have witnessed?
couldn't he have witnessed?
couldn't we have witnessed?
couldn't you have witnessed?
couldn't they have witnessed? 	couldn't I have been witnessing?
couldn't you have been witnessing?
couldn't he have been witnessing?
couldn't we have been witnessing?
couldn't you have been witnessing?
couldn't they have been witnessing?