Conjugação do verbo inglês
COULD PERFORM

Verbo regular: perform - performed - performed

Afirmação

Forma simple	Forma com V-ing
I could perform you could perform she could perform we could perform you could perform they could perform	I could be performing you could be performing she could be performing we could be performing you could be performing they could be performing
Perfeito	Perfeito com V-ing
I could have performed you could have performed she could have performed we could have performed you could have performed they could have performed	I could have been performing you could have been performing she could have been performing we could have been performing you could have been performing they could have been performing

Negação

Forma simple	Forma com V-ing
I couldn't perform you couldn't perform she couldn't perform we couldn't perform you couldn't perform they couldn't perform	I couldn't be performing you couldn't be performing she couldn't be performing we couldn't be performing you couldn't be performing they couldn't be performing
Perfeito	Perfeito com V-ing
I couldn't have performed you couldn't have performed she couldn't have performed we couldn't have performed you couldn't have performed they couldn't have performed	I couldn't have been performing you couldn't have been performing she couldn't have been performing we couldn't have been performing you couldn't have been performing they couldn't have been performing

Forma interrogativa

Forma simple	Forma com V-ing
could I perform? could you perform? could she perform? could we perform? could you perform? could they perform?	could I be performing? could you be performing? could she be performing? could we be performing? could you be performing? could they be performing?
Perfeito	Perfeito com V-ing
could I have performed? could you have performed? could she have performed? could we have performed? could you have performed? could they have performed?	could I have been performing? could you have been performing? could she have been performing? could we have been performing? could you have been performing? could they have been performing?

Forma interro-Negação

Forma simple	Forma com V-ing
couldn't I perform? couldn't you perform? couldn't she perform? couldn't we perform? couldn't you perform? couldn't they perform?	couldn't I be performing? couldn't you be performing? couldn't she be performing? couldn't we be performing? couldn't you be performing? couldn't they be performing?
Perfeito	Perfeito com V-ing
couldn't I have performed? couldn't you have performed? couldn't she have performed? couldn't we have performed? couldn't you have performed? couldn't they have performed?	couldn't I have been performing? couldn't you have been performing? couldn't she have been performing? couldn't we have been performing? couldn't you have been performing? couldn't they have been performing?