I could butylate you could butylate he could butylate we could butylate you could butylate they could butylate
Forme en V-ing
I could be butylating you could be butylating he could be butylating we could be butylating you could be butylating they could be butylating
Perfect
I could have butylated you could have butylated he could have butylated we could have butylated you could have butylated they could have butylated
Perfect en V-ing
I could have been butylating you could have been butylating he could have been butylating we could have been butylating you could have been butylating they could have been butylating
Négation
Forme simple
I could not butylate you could not butylate he could not butylate we could not butylate you could not butylate they could not butylate
Forme en V-ing
I could not be butylating you could not be butylating he could not be butylating we could not be butylating you could not be butylating they could not be butylating
Perfect
I could not have butylated you could not have butylated he could not have butylated we could not have butylated you could not have butylated they could not have butylated
Perfect en V-ing
I could not have been butylating you could not have been butylating he could not have been butylating we could not have been butylating you could not have been butylating they could not have been butylating
Forme interrogative
Forme simple
could I butylate? could you butylate? could he butylate? could we butylate? could you butylate? could they butylate?
Forme en V-ing
could I be butylating? could you be butylating? could he be butylating? could we be butylating? could you be butylating? could they be butylating?
Perfect
could I have butylated? could you have butylated? could he have butylated? could we have butylated? could you have butylated? could they have butylated?
Perfect en V-ing
could I have been butylating? could you have been butylating? could he have been butylating? could we have been butylating? could you have been butylating? could they have been butylating?
Forme interro-négative
Forme simple
could I not butylate? could you not butylate? could he not butylate? could we not butylate? could you not butylate? could they not butylate?
Forme en V-ing
could I not be butylating? could you not be butylating? could he not be butylating? could we not be butylating? could you not be butylating? could they not be butylating?
Perfect
could I not have butylated? could you not have butylated? could he not have butylated? could we not have butylated? could you not have butylated? could they not have butylated?
Perfect en V-ing
could I not have been butylating? could you not have been butylating? could he not have been butylating? could we not have been butylating? could you not have been butylating? could they not have been butylating?