Conjugação do verbo inglês
COULD PREVENT

Verbo regular: prevent - prevented - prevented

Afirmação

Forma simple	Forma com V-ing
I could prevent you could prevent she could prevent we could prevent you could prevent they could prevent	I could be preventing you could be preventing she 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 she 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 she 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 couldn't prevent you couldn't prevent she couldn't prevent we couldn't prevent you couldn't prevent they couldn't prevent	I couldn't be preventing you couldn't be preventing she couldn't be preventing we couldn't be preventing you couldn't be preventing they couldn't be preventing
Perfeito	Perfeito com V-ing
I couldn't have prevented you couldn't have prevented she couldn't have prevented we couldn't have prevented you couldn't have prevented they couldn't have prevented	I couldn't have been preventing you couldn't have been preventing she couldn't have been preventing we couldn't have been preventing you couldn't have been preventing they couldn't have been preventing

Forma interrogativa

Forma simple	Forma com V-ing
could I prevent? could you prevent? could she prevent? could we prevent? could you prevent? could they prevent?	could I be preventing? could you be preventing? could she 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 she 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 she 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
couldn't I prevent? couldn't you prevent? couldn't she prevent? couldn't we prevent? couldn't you prevent? couldn't they prevent?	couldn't I be preventing? couldn't you be preventing? couldn't she be preventing? couldn't we be preventing? couldn't you be preventing? couldn't they be preventing?
Perfeito	Perfeito com V-ing
couldn't I have prevented? couldn't you have prevented? couldn't she have prevented? couldn't we have prevented? couldn't you have prevented? couldn't they have prevented?	couldn't I have been preventing? couldn't you have been preventing? couldn't she have been preventing? couldn't we have been preventing? couldn't you have been preventing? couldn't they have been preventing?