I could serry you could serry he could serry we could serry you could serry they could serry
Forme en V-ing
I could be serrying you could be serrying he could be serrying we could be serrying you could be serrying they could be serrying
Perfect
I could have serried you could have serried he could have serried we could have serried you could have serried they could have serried
Perfect en V-ing
I could have been serrying you could have been serrying he could have been serrying we could have been serrying you could have been serrying they could have been serrying
Négation
Forme simple
I could not serry you could not serry he could not serry we could not serry you could not serry they could not serry
Forme en V-ing
I could not be serrying you could not be serrying he could not be serrying we could not be serrying you could not be serrying they could not be serrying
Perfect
I could not have serried you could not have serried he could not have serried we could not have serried you could not have serried they could not have serried
Perfect en V-ing
I could not have been serrying you could not have been serrying he could not have been serrying we could not have been serrying you could not have been serrying they could not have been serrying
Forme interrogative
Forme simple
could I serry? could you serry? could he serry? could we serry? could you serry? could they serry?
Forme en V-ing
could I be serrying? could you be serrying? could he be serrying? could we be serrying? could you be serrying? could they be serrying?
Perfect
could I have serried? could you have serried? could he have serried? could we have serried? could you have serried? could they have serried?
Perfect en V-ing
could I have been serrying? could you have been serrying? could he have been serrying? could we have been serrying? could you have been serrying? could they have been serrying?
Forme interro-négative
Forme simple
could I not serry? could you not serry? could he not serry? could we not serry? could you not serry? could they not serry?
Forme en V-ing
could I not be serrying? could you not be serrying? could he not be serrying? could we not be serrying? could you not be serrying? could they not be serrying?
Perfect
could I not have serried? could you not have serried? could he not have serried? could we not have serried? could you not have serried? could they not have serried?
Perfect en V-ing
could I not have been serrying? could you not have been serrying? could he not have been serrying? could we not have been serrying? could you not have been serrying? could they not have been serrying?