Conjugação do verbo inglês
COULD QUACK

Verbo regular: quack - quacked - quacked

Afirmação

Forma simple	Forma com V-ing
I could quack you could quack he could quack we could quack you could quack they could quack	I could be quacking you could be quacking he could be quacking we could be quacking you could be quacking they could be quacking
Perfeito	Perfeito com V-ing
I could have quacked you could have quacked he could have quacked we could have quacked you could have quacked they could have quacked	I could have been quacking you could have been quacking he could have been quacking we could have been quacking you could have been quacking they could have been quacking

Negação

Forma simple	Forma com V-ing
I couldn't quack you couldn't quack he couldn't quack we couldn't quack you couldn't quack they couldn't quack	I couldn't be quacking you couldn't be quacking he couldn't be quacking we couldn't be quacking you couldn't be quacking they couldn't be quacking
Perfeito	Perfeito com V-ing
I couldn't have quacked you couldn't have quacked he couldn't have quacked we couldn't have quacked you couldn't have quacked they couldn't have quacked	I couldn't have been quacking you couldn't have been quacking he couldn't have been quacking we couldn't have been quacking you couldn't have been quacking they couldn't have been quacking

Forma interrogativa

Forma simple	Forma com V-ing
could I quack? could you quack? could he quack? could we quack? could you quack? could they quack?	could I be quacking? could you be quacking? could he be quacking? could we be quacking? could you be quacking? could they be quacking?
Perfeito	Perfeito com V-ing
could I have quacked? could you have quacked? could he have quacked? could we have quacked? could you have quacked? could they have quacked?	could I have been quacking? could you have been quacking? could he have been quacking? could we have been quacking? could you have been quacking? could they have been quacking?

Forma interro-Negação

Forma simple	Forma com V-ing
couldn't I quack? couldn't you quack? couldn't he quack? couldn't we quack? couldn't you quack? couldn't they quack?	couldn't I be quacking? couldn't you be quacking? couldn't he be quacking? couldn't we be quacking? couldn't you be quacking? couldn't they be quacking?
Perfeito	Perfeito com V-ing
couldn't I have quacked? couldn't you have quacked? couldn't he have quacked? couldn't we have quacked? couldn't you have quacked? couldn't they have quacked?	couldn't I have been quacking? couldn't you have been quacking? couldn't he have been quacking? couldn't we have been quacking? couldn't you have been quacking? couldn't they have been quacking?