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