I could sustain you could sustain she could sustain we could sustain you could sustain they could sustain
Forma com V-ing
I could be sustaining you could be sustaining she could be sustaining we could be sustaining you could be sustaining they could be sustaining
Perfeito
I could have sustained you could have sustained she could have sustained we could have sustained you could have sustained they could have sustained
Perfeito com V-ing
I could have been sustaining you could have been sustaining she could have been sustaining we could have been sustaining you could have been sustaining they could have been sustaining
Negação
Forma simple
I couldn't sustain you couldn't sustain she couldn't sustain we couldn't sustain you couldn't sustain they couldn't sustain
Forma com V-ing
I couldn't be sustaining you couldn't be sustaining she couldn't be sustaining we couldn't be sustaining you couldn't be sustaining they couldn't be sustaining
Perfeito
I couldn't have sustained you couldn't have sustained she couldn't have sustained we couldn't have sustained you couldn't have sustained they couldn't have sustained
Perfeito com V-ing
I couldn't have been sustaining you couldn't have been sustaining she couldn't have been sustaining we couldn't have been sustaining you couldn't have been sustaining they couldn't have been sustaining
Forma interrogativa
Forma simple
could I sustain? could you sustain? could she sustain? could we sustain? could you sustain? could they sustain?
Forma com V-ing
could I be sustaining? could you be sustaining? could she be sustaining? could we be sustaining? could you be sustaining? could they be sustaining?
Perfeito
could I have sustained? could you have sustained? could she have sustained? could we have sustained? could you have sustained? could they have sustained?
Perfeito com V-ing
could I have been sustaining? could you have been sustaining? could she have been sustaining? could we have been sustaining? could you have been sustaining? could they have been sustaining?
Forma interro-Negação
Forma simple
couldn't I sustain? couldn't you sustain? couldn't she sustain? couldn't we sustain? couldn't you sustain? couldn't they sustain?
Forma com V-ing
couldn't I be sustaining? couldn't you be sustaining? couldn't she be sustaining? couldn't we be sustaining? couldn't you be sustaining? couldn't they be sustaining?
Perfeito
couldn't I have sustained? couldn't you have sustained? couldn't she have sustained? couldn't we have sustained? couldn't you have sustained? couldn't they have sustained?
Perfeito com V-ing
couldn't I have been sustaining? couldn't you have been sustaining? couldn't she have been sustaining? couldn't we have been sustaining? couldn't you have been sustaining? couldn't they have been sustaining?