Conjugação do verbo inglês
COULD USE

Verbo regular: use - used - used

Afirmação

Forma simple	Forma com V-ing
I could use you could use she could use we could use you could use they could use	I could be using you could be using she could be using we could be using you could be using they could be using
Perfeito	Perfeito com V-ing
I could have used you could have used she could have used we could have used you could have used they could have used	I could have been using you could have been using she could have been using we could have been using you could have been using they could have been using

Negação

Forma simple	Forma com V-ing
I couldn't use you couldn't use she couldn't use we couldn't use you couldn't use they couldn't use	I couldn't be using you couldn't be using she couldn't be using we couldn't be using you couldn't be using they couldn't be using
Perfeito	Perfeito com V-ing
I couldn't have used you couldn't have used she couldn't have used we couldn't have used you couldn't have used they couldn't have used	I couldn't have been using you couldn't have been using she couldn't have been using we couldn't have been using you couldn't have been using they couldn't have been using

Forma interrogativa

Forma simple	Forma com V-ing
could I use? could you use? could she use? could we use? could you use? could they use?	could I be using? could you be using? could she be using? could we be using? could you be using? could they be using?
Perfeito	Perfeito com V-ing
could I have used? could you have used? could she have used? could we have used? could you have used? could they have used?	could I have been using? could you have been using? could she have been using? could we have been using? could you have been using? could they have been using?

Forma interro-Negação

Forma simple	Forma com V-ing
couldn't I use? couldn't you use? couldn't she use? couldn't we use? couldn't you use? couldn't they use?	couldn't I be using? couldn't you be using? couldn't she be using? couldn't we be using? couldn't you be using? couldn't they be using?
Perfeito	Perfeito com V-ing
couldn't I have used? couldn't you have used? couldn't she have used? couldn't we have used? couldn't you have used? couldn't they have used?	couldn't I have been using? couldn't you have been using? couldn't she have been using? couldn't we have been using? couldn't you have been using? couldn't they have been using?