I could sustain you could sustain she could sustain we could sustain you could sustain they could sustain
Forme en 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
Perfect
I could have sustained you could have sustained she could have sustained we could have sustained you could have sustained they could have sustained
Perfect en 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
Négation
Forme simple
I could not sustain you could not sustain she could not sustain we could not sustain you could not sustain they could not sustain
Forme en V-ing
I could not be sustaining you could not be sustaining she could not be sustaining we could not be sustaining you could not be sustaining they could not be sustaining
Perfect
I could not have sustained you could not have sustained she could not have sustained we could not have sustained you could not have sustained they could not have sustained
Perfect en V-ing
I could not have been sustaining you could not have been sustaining she could not have been sustaining we could not have been sustaining you could not have been sustaining they could not have been sustaining
Forme interrogative
Forme simple
could I sustain? could you sustain? could she sustain? could we sustain? could you sustain? could they sustain?
Forme en 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?
Perfect
could I have sustained? could you have sustained? could she have sustained? could we have sustained? could you have sustained? could they have sustained?
Perfect en 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?
Forme interro-négative
Forme simple
could I not sustain? could you not sustain? could she not sustain? could we not sustain? could you not sustain? could they not sustain?
Forme en V-ing
could I not be sustaining? could you not be sustaining? could she not be sustaining? could we not be sustaining? could you not be sustaining? could they not be sustaining?
Perfect
could I not have sustained? could you not have sustained? could she not have sustained? could we not have sustained? could you not have sustained? could they not have sustained?
Perfect en V-ing
could I not have been sustaining? could you not have been sustaining? could she not have been sustaining? could we not have been sustaining? could you not have been sustaining? could they not have been sustaining?