I could summate you could summate he could summate we could summate you could summate they could summate
Forme en V-ing
I could be summating you could be summating he could be summating we could be summating you could be summating they could be summating
Perfect
I could have summated you could have summated he could have summated we could have summated you could have summated they could have summated
Perfect en V-ing
I could have been summating you could have been summating he could have been summating we could have been summating you could have been summating they could have been summating
Négation
Forme simple
I could not summate you could not summate he could not summate we could not summate you could not summate they could not summate
Forme en V-ing
I could not be summating you could not be summating he could not be summating we could not be summating you could not be summating they could not be summating
Perfect
I could not have summated you could not have summated he could not have summated we could not have summated you could not have summated they could not have summated
Perfect en V-ing
I could not have been summating you could not have been summating he could not have been summating we could not have been summating you could not have been summating they could not have been summating
Forme interrogative
Forme simple
could I summate? could you summate? could he summate? could we summate? could you summate? could they summate?
Forme en V-ing
could I be summating? could you be summating? could he be summating? could we be summating? could you be summating? could they be summating?
Perfect
could I have summated? could you have summated? could he have summated? could we have summated? could you have summated? could they have summated?
Perfect en V-ing
could I have been summating? could you have been summating? could he have been summating? could we have been summating? could you have been summating? could they have been summating?
Forme interro-négative
Forme simple
could I not summate? could you not summate? could he not summate? could we not summate? could you not summate? could they not summate?
Forme en V-ing
could I not be summating? could you not be summating? could he not be summating? could we not be summating? could you not be summating? could they not be summating?
Perfect
could I not have summated? could you not have summated? could he not have summated? could we not have summated? could you not have summated? could they not have summated?
Perfect en V-ing
could I not have been summating? could you not have been summating? could he not have been summating? could we not have been summating? could you not have been summating? could they not have been summating?