I could stumble you could stumble she could stumble we could stumble you could stumble they could stumble
Forma com V-ing
I could be stumbling you could be stumbling she could be stumbling we could be stumbling you could be stumbling they could be stumbling
Perfeito
I could have stumbled you could have stumbled she could have stumbled we could have stumbled you could have stumbled they could have stumbled
Perfeito com V-ing
I could have been stumbling you could have been stumbling she could have been stumbling we could have been stumbling you could have been stumbling they could have been stumbling
Negação
Forma simple
I couldn't stumble you couldn't stumble she couldn't stumble we couldn't stumble you couldn't stumble they couldn't stumble
Forma com V-ing
I couldn't be stumbling you couldn't be stumbling she couldn't be stumbling we couldn't be stumbling you couldn't be stumbling they couldn't be stumbling
Perfeito
I couldn't have stumbled you couldn't have stumbled she couldn't have stumbled we couldn't have stumbled you couldn't have stumbled they couldn't have stumbled
Perfeito com V-ing
I couldn't have been stumbling you couldn't have been stumbling she couldn't have been stumbling we couldn't have been stumbling you couldn't have been stumbling they couldn't have been stumbling
Forma interrogativa
Forma simple
could I stumble? could you stumble? could she stumble? could we stumble? could you stumble? could they stumble?
Forma com V-ing
could I be stumbling? could you be stumbling? could she be stumbling? could we be stumbling? could you be stumbling? could they be stumbling?
Perfeito
could I have stumbled? could you have stumbled? could she have stumbled? could we have stumbled? could you have stumbled? could they have stumbled?
Perfeito com V-ing
could I have been stumbling? could you have been stumbling? could she have been stumbling? could we have been stumbling? could you have been stumbling? could they have been stumbling?
Forma interro-Negação
Forma simple
couldn't I stumble? couldn't you stumble? couldn't she stumble? couldn't we stumble? couldn't you stumble? couldn't they stumble?
Forma com V-ing
couldn't I be stumbling? couldn't you be stumbling? couldn't she be stumbling? couldn't we be stumbling? couldn't you be stumbling? couldn't they be stumbling?
Perfeito
couldn't I have stumbled? couldn't you have stumbled? couldn't she have stumbled? couldn't we have stumbled? couldn't you have stumbled? couldn't they have stumbled?
Perfeito com V-ing
couldn't I have been stumbling? couldn't you have been stumbling? couldn't she have been stumbling? couldn't we have been stumbling? couldn't you have been stumbling? couldn't they have been stumbling?