Conjugação do verbo inglês
COULD UNDERSIGN

Verbo regular: undersign - undersigned - undersigned

Afirmação

Forma simple	Forma com V-ing
I could undersign you could undersign he could undersign we could undersign you could undersign they could undersign	I could be undersigning you could be undersigning he could be undersigning we could be undersigning you could be undersigning they could be undersigning
Perfeito	Perfeito com V-ing
I could have undersigned you could have undersigned he could have undersigned we could have undersigned you could have undersigned they could have undersigned	I could have been undersigning you could have been undersigning he could have been undersigning we could have been undersigning you could have been undersigning they could have been undersigning

Negação

Forma simple	Forma com V-ing
I couldn't undersign you couldn't undersign he couldn't undersign we couldn't undersign you couldn't undersign they couldn't undersign	I couldn't be undersigning you couldn't be undersigning he couldn't be undersigning we couldn't be undersigning you couldn't be undersigning they couldn't be undersigning
Perfeito	Perfeito com V-ing
I couldn't have undersigned you couldn't have undersigned he couldn't have undersigned we couldn't have undersigned you couldn't have undersigned they couldn't have undersigned	I couldn't have been undersigning you couldn't have been undersigning he couldn't have been undersigning we couldn't have been undersigning you couldn't have been undersigning they couldn't have been undersigning

Forma interrogativa

Forma simple	Forma com V-ing
could I undersign? could you undersign? could he undersign? could we undersign? could you undersign? could they undersign?	could I be undersigning? could you be undersigning? could he be undersigning? could we be undersigning? could you be undersigning? could they be undersigning?
Perfeito	Perfeito com V-ing
could I have undersigned? could you have undersigned? could he have undersigned? could we have undersigned? could you have undersigned? could they have undersigned?	could I have been undersigning? could you have been undersigning? could he have been undersigning? could we have been undersigning? could you have been undersigning? could they have been undersigning?

Forma interro-Negação

Forma simple	Forma com V-ing
couldn't I undersign? couldn't you undersign? couldn't he undersign? couldn't we undersign? couldn't you undersign? couldn't they undersign?	couldn't I be undersigning? couldn't you be undersigning? couldn't he be undersigning? couldn't we be undersigning? couldn't you be undersigning? couldn't they be undersigning?
Perfeito	Perfeito com V-ing
couldn't I have undersigned? couldn't you have undersigned? couldn't he have undersigned? couldn't we have undersigned? couldn't you have undersigned? couldn't they have undersigned?	couldn't I have been undersigning? couldn't you have been undersigning? couldn't he have been undersigning? couldn't we have been undersigning? couldn't you have been undersigning? couldn't they have been undersigning?