Conjugação do verbo inglês
COULD ROOF

Verbo regular: roof - roofed - roofed

Afirmação

Forma simple	Forma com V-ing
I could roof you could roof he could roof we could roof you could roof they could roof	I could be roofing you could be roofing he could be roofing we could be roofing you could be roofing they could be roofing
Perfeito	Perfeito com V-ing
I could have roofed you could have roofed he could have roofed we could have roofed you could have roofed they could have roofed	I could have been roofing you could have been roofing he could have been roofing we could have been roofing you could have been roofing they could have been roofing

Negação

Forma simple	Forma com V-ing
I couldn't roof you couldn't roof he couldn't roof we couldn't roof you couldn't roof they couldn't roof	I couldn't be roofing you couldn't be roofing he couldn't be roofing we couldn't be roofing you couldn't be roofing they couldn't be roofing
Perfeito	Perfeito com V-ing
I couldn't have roofed you couldn't have roofed he couldn't have roofed we couldn't have roofed you couldn't have roofed they couldn't have roofed	I couldn't have been roofing you couldn't have been roofing he couldn't have been roofing we couldn't have been roofing you couldn't have been roofing they couldn't have been roofing

Forma interrogativa

Forma simple	Forma com V-ing
could I roof? could you roof? could he roof? could we roof? could you roof? could they roof?	could I be roofing? could you be roofing? could he be roofing? could we be roofing? could you be roofing? could they be roofing?
Perfeito	Perfeito com V-ing
could I have roofed? could you have roofed? could he have roofed? could we have roofed? could you have roofed? could they have roofed?	could I have been roofing? could you have been roofing? could he have been roofing? could we have been roofing? could you have been roofing? could they have been roofing?

Forma interro-Negação

Forma simple	Forma com V-ing
couldn't I roof? couldn't you roof? couldn't he roof? couldn't we roof? couldn't you roof? couldn't they roof?	couldn't I be roofing? couldn't you be roofing? couldn't he be roofing? couldn't we be roofing? couldn't you be roofing? couldn't they be roofing?
Perfeito	Perfeito com V-ing
couldn't I have roofed? couldn't you have roofed? couldn't he have roofed? couldn't we have roofed? couldn't you have roofed? couldn't they have roofed?	couldn't I have been roofing? couldn't you have been roofing? couldn't he have been roofing? couldn't we have been roofing? couldn't you have been roofing? couldn't they have been roofing?