I can backsolve you can backsolve she can backsolve we can backsolve you can backsolve they can backsolve
Forme en V-ing
I can be backsolving you can be backsolving she can be backsolving we can be backsolving you can be backsolving they can be backsolving
Perfect
I can have backsolved you can have backsolved she can have backsolved we can have backsolved you can have backsolved they can have backsolved
Perfect en V-ing
I can have been backsolving you can have been backsolving she can have been backsolving we can have been backsolving you can have been backsolving they can have been backsolving
Négation
Forme simple
I cannot backsolve you cannot backsolve she cannot backsolve we cannot backsolve you cannot backsolve they cannot backsolve
Forme en V-ing
I cannot be backsolving you cannot be backsolving she cannot be backsolving we cannot be backsolving you cannot be backsolving they cannot be backsolving
Perfect
I cannot have backsolved you cannot have backsolved she cannot have backsolved we cannot have backsolved you cannot have backsolved they cannot have backsolved
Perfect en V-ing
I cannot have been backsolving you cannot have been backsolving she cannot have been backsolving we cannot have been backsolving you cannot have been backsolving they cannot have been backsolving
Forme interrogative
Forme simple
can I backsolve? can you backsolve? can she backsolve? can we backsolve? can you backsolve? can they backsolve?
Forme en V-ing
can I be backsolving? can you be backsolving? can she be backsolving? can we be backsolving? can you be backsolving? can they be backsolving?
Perfect
can I have backsolved? can you have backsolved? can she have backsolved? can we have backsolved? can you have backsolved? can they have backsolved?
Perfect en V-ing
can I have been backsolving? can you have been backsolving? can she have been backsolving? can we have been backsolving? can you have been backsolving? can they have been backsolving?
Forme interro-négative
Forme simple
can I not backsolve? can you not backsolve? can she not backsolve? can we not backsolve? can you not backsolve? can they not backsolve?
Forme en V-ing
can I not be backsolving? can you not be backsolving? can she not be backsolving? can we not be backsolving? can you not be backsolving? can they not be backsolving?
Perfect
can I not have backsolved? can you not have backsolved? can she not have backsolved? can we not have backsolved? can you not have backsolved? can they not have backsolved?
Perfect en V-ing
can I not have been backsolving? can you not have been backsolving? can she not have been backsolving? can we not have been backsolving? can you not have been backsolving? can they not have been backsolving?