Conjugação do verbo inglês
COULD WITNESS

Verbo regular: witness - witnessed - witnessed

Afirmação

Forma simple	Forma com 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
Perfeito	Perfeito com V-ing
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

Negação

Forma simple	Forma com 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
Perfeito	Perfeito com V-ing
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

Forma interrogativa

Forma simple	Forma com 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?
Perfeito	Perfeito com V-ing
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?

Forma interro-Negação

Forma simple	Forma com 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?
Perfeito	Perfeito com V-ing
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?