I can improve you can improve he can improve we can improve you can improve they can improve
Forme en V-ing
I can be improving you can be improving he can be improving we can be improving you can be improving they can be improving
Perfect
I can have improved you can have improved he can have improved we can have improved you can have improved they can have improved
Perfect en V-ing
I can have been improving you can have been improving he can have been improving we can have been improving you can have been improving they can have been improving
Négation
Forme simple
I can't improve you can't improve he can't improve we can't improve you can't improve they can't improve
Forme en V-ing
I can't be improving you can't be improving he can't be improving we can't be improving you can't be improving they can't be improving
Perfect
I can't have improved you can't have improved he can't have improved we can't have improved you can't have improved they can't have improved
Perfect en V-ing
I can't have been improving you can't have been improving he can't have been improving we can't have been improving you can't have been improving they can't have been improving
Forme interrogative
Forme simple
can I improve? can you improve? can he improve? can we improve? can you improve? can they improve?
Forme en V-ing
can I be improving? can you be improving? can he be improving? can we be improving? can you be improving? can they be improving?
Perfect
can I have improved? can you have improved? can he have improved? can we have improved? can you have improved? can they have improved?
Perfect en V-ing
can I have been improving? can you have been improving? can he have been improving? can we have been improving? can you have been improving? can they have been improving?
Forme interro-négative
Forme simple
can't I improve? can't you improve? can't he improve? can't we improve? can't you improve? can't they improve?
Forme en V-ing
can't I be improving? can't you be improving? can't he be improving? can't we be improving? can't you be improving? can't they be improving?
Perfect
can't I have improved? can't you have improved? can't he have improved? can't we have improved? can't you have improved? can't they have improved?
Perfect en V-ing
can't I have been improving? can't you have been improving? can't he have been improving? can't we have been improving? can't you have been improving? can't they have been improving?