Conjugação do verbo inglês
COULD PREVENT

Verbo regular: prevent - prevented - prevented

Afirmação

Forma simple	Forma com V-ing
I could prevent you could prevent he could prevent we could prevent you could prevent they could prevent	I could be preventing you could be preventing he could be preventing we could be preventing you could be preventing they could be preventing
Perfeito	Perfeito com V-ing
I could have prevented you could have prevented he could have prevented we could have prevented you could have prevented they could have prevented	I could have been preventing you could have been preventing he could have been preventing we could have been preventing you could have been preventing they could have been preventing

Negação

Forma simple	Forma com V-ing
I could not prevent you could not prevent he could not prevent we could not prevent you could not prevent they could not prevent	I could not be preventing you could not be preventing he could not be preventing we could not be preventing you could not be preventing they could not be preventing
Perfeito	Perfeito com V-ing
I could not have prevented you could not have prevented he could not have prevented we could not have prevented you could not have prevented they could not have prevented	I could not have been preventing you could not have been preventing he could not have been preventing we could not have been preventing you could not have been preventing they could not have been preventing

Forma interrogativa

Forma simple	Forma com V-ing
could I prevent? could you prevent? could he prevent? could we prevent? could you prevent? could they prevent?	could I be preventing? could you be preventing? could he be preventing? could we be preventing? could you be preventing? could they be preventing?
Perfeito	Perfeito com V-ing
could I have prevented? could you have prevented? could he have prevented? could we have prevented? could you have prevented? could they have prevented?	could I have been preventing? could you have been preventing? could he have been preventing? could we have been preventing? could you have been preventing? could they have been preventing?

Forma interro-Negação

Forma simple	Forma com V-ing
could I not prevent? could you not prevent? could he not prevent? could we not prevent? could you not prevent? could they not prevent?	could I not be preventing? could you not be preventing? could he not be preventing? could we not be preventing? could you not be preventing? could they not be preventing?
Perfeito	Perfeito com V-ing
could I not have prevented? could you not have prevented? could he not have prevented? could we not have prevented? could you not have prevented? could they not have prevented?	could I not have been preventing? could you not have been preventing? could he not have been preventing? could we not have been preventing? could you not have been preventing? could they not have been preventing?