Conjugação do verbo inglês
COULD TIFF

Verbo regular: tiff - tiffed - tiffed

Afirmação

Forma simple	Forma com V-ing
I could tiff you could tiff he could tiff we could tiff you could tiff they could tiff	I could be tiffing you could be tiffing he could be tiffing we could be tiffing you could be tiffing they could be tiffing
Perfeito	Perfeito com V-ing
I could have tiffed you could have tiffed he could have tiffed we could have tiffed you could have tiffed they could have tiffed	I could have been tiffing you could have been tiffing he could have been tiffing we could have been tiffing you could have been tiffing they could have been tiffing

Negação

Forma simple	Forma com V-ing
I couldn't tiff you couldn't tiff he couldn't tiff we couldn't tiff you couldn't tiff they couldn't tiff	I couldn't be tiffing you couldn't be tiffing he couldn't be tiffing we couldn't be tiffing you couldn't be tiffing they couldn't be tiffing
Perfeito	Perfeito com V-ing
I couldn't have tiffed you couldn't have tiffed he couldn't have tiffed we couldn't have tiffed you couldn't have tiffed they couldn't have tiffed	I couldn't have been tiffing you couldn't have been tiffing he couldn't have been tiffing we couldn't have been tiffing you couldn't have been tiffing they couldn't have been tiffing

Forma interrogativa

Forma simple	Forma com V-ing
could I tiff? could you tiff? could he tiff? could we tiff? could you tiff? could they tiff?	could I be tiffing? could you be tiffing? could he be tiffing? could we be tiffing? could you be tiffing? could they be tiffing?
Perfeito	Perfeito com V-ing
could I have tiffed? could you have tiffed? could he have tiffed? could we have tiffed? could you have tiffed? could they have tiffed?	could I have been tiffing? could you have been tiffing? could he have been tiffing? could we have been tiffing? could you have been tiffing? could they have been tiffing?

Forma interro-Negação

Forma simple	Forma com V-ing
couldn't I tiff? couldn't you tiff? couldn't he tiff? couldn't we tiff? couldn't you tiff? couldn't they tiff?	couldn't I be tiffing? couldn't you be tiffing? couldn't he be tiffing? couldn't we be tiffing? couldn't you be tiffing? couldn't they be tiffing?
Perfeito	Perfeito com V-ing
couldn't I have tiffed? couldn't you have tiffed? couldn't he have tiffed? couldn't we have tiffed? couldn't you have tiffed? couldn't they have tiffed?	couldn't I have been tiffing? couldn't you have been tiffing? couldn't he have been tiffing? couldn't we have been tiffing? couldn't you have been tiffing? couldn't they have been tiffing?