I could retrofit you could retrofit he could retrofit we could retrofit you could retrofit they could retrofit
Forme en V-ing
I could be retrofiting you could be retrofiting he could be retrofiting we could be retrofiting you could be retrofiting they could be retrofiting
Perfect
I could have retrofit you could have retrofit he could have retrofit we could have retrofit you could have retrofit they could have retrofit
Perfect en V-ing
I could have been retrofiting you could have been retrofiting he could have been retrofiting we could have been retrofiting you could have been retrofiting they could have been retrofiting
Négation
Forme simple
I couldn't retrofit you couldn't retrofit he couldn't retrofit we couldn't retrofit you couldn't retrofit they couldn't retrofit
Forme en V-ing
I couldn't be retrofiting you couldn't be retrofiting he couldn't be retrofiting we couldn't be retrofiting you couldn't be retrofiting they couldn't be retrofiting
Perfect
I couldn't have retrofit you couldn't have retrofit he couldn't have retrofit we couldn't have retrofit you couldn't have retrofit they couldn't have retrofit
Perfect en V-ing
I couldn't have been retrofiting you couldn't have been retrofiting he couldn't have been retrofiting we couldn't have been retrofiting you couldn't have been retrofiting they couldn't have been retrofiting
Forme interrogative
Forme simple
could I retrofit? could you retrofit? could he retrofit? could we retrofit? could you retrofit? could they retrofit?
Forme en V-ing
could I be retrofiting? could you be retrofiting? could he be retrofiting? could we be retrofiting? could you be retrofiting? could they be retrofiting?
Perfect
could I have retrofit? could you have retrofit? could he have retrofit? could we have retrofit? could you have retrofit? could they have retrofit?
Perfect en V-ing
could I have been retrofiting? could you have been retrofiting? could he have been retrofiting? could we have been retrofiting? could you have been retrofiting? could they have been retrofiting?
Forme interro-négative
Forme simple
couldn't I retrofit? couldn't you retrofit? couldn't he retrofit? couldn't we retrofit? couldn't you retrofit? couldn't they retrofit?
Forme en V-ing
couldn't I be retrofiting? couldn't you be retrofiting? couldn't he be retrofiting? couldn't we be retrofiting? couldn't you be retrofiting? couldn't they be retrofiting?
Perfect
couldn't I have retrofit? couldn't you have retrofit? couldn't he have retrofit? couldn't we have retrofit? couldn't you have retrofit? couldn't they have retrofit?
Perfect en V-ing
couldn't I have been retrofiting? couldn't you have been retrofiting? couldn't he have been retrofiting? couldn't we have been retrofiting? couldn't you have been retrofiting? couldn't they have been retrofiting?