I could backsolve you could backsolve she could backsolve we could backsolve you could backsolve they could backsolve
Forme en V-ing
I could be backsolving you could be backsolving she could be backsolving we could be backsolving you could be backsolving they could be backsolving
Perfect
I could have backsolved you could have backsolved she could have backsolved we could have backsolved you could have backsolved they could have backsolved
Perfect en V-ing
I could have been backsolving you could have been backsolving she could have been backsolving we could have been backsolving you could have been backsolving they could have been backsolving
Négation
Forme simple
I couldn't backsolve you couldn't backsolve she couldn't backsolve we couldn't backsolve you couldn't backsolve they couldn't backsolve
Forme en V-ing
I couldn't be backsolving you couldn't be backsolving she couldn't be backsolving we couldn't be backsolving you couldn't be backsolving they couldn't be backsolving
Perfect
I couldn't have backsolved you couldn't have backsolved she couldn't have backsolved we couldn't have backsolved you couldn't have backsolved they couldn't have backsolved
Perfect en V-ing
I couldn't have been backsolving you couldn't have been backsolving she couldn't have been backsolving we couldn't have been backsolving you couldn't have been backsolving they couldn't have been backsolving
Forme interrogative
Forme simple
could I backsolve? could you backsolve? could she backsolve? could we backsolve? could you backsolve? could they backsolve?
Forme en V-ing
could I be backsolving? could you be backsolving? could she be backsolving? could we be backsolving? could you be backsolving? could they be backsolving?
Perfect
could I have backsolved? could you have backsolved? could she have backsolved? could we have backsolved? could you have backsolved? could they have backsolved?
Perfect en V-ing
could I have been backsolving? could you have been backsolving? could she have been backsolving? could we have been backsolving? could you have been backsolving? could they have been backsolving?
Forme interro-négative
Forme simple
couldn't I backsolve? couldn't you backsolve? couldn't she backsolve? couldn't we backsolve? couldn't you backsolve? couldn't they backsolve?
Forme en V-ing
couldn't I be backsolving? couldn't you be backsolving? couldn't she be backsolving? couldn't we be backsolving? couldn't you be backsolving? couldn't they be backsolving?
Perfect
couldn't I have backsolved? couldn't you have backsolved? couldn't she have backsolved? couldn't we have backsolved? couldn't you have backsolved? couldn't they have backsolved?
Perfect en V-ing
couldn't I have been backsolving? couldn't you have been backsolving? couldn't she have been backsolving? couldn't we have been backsolving? couldn't you have been backsolving? couldn't they have been backsolving?