I could assoil you could assoil he could assoil we could assoil you could assoil they could assoil
V-ing form
I could be assoiling you could be assoiling he could be assoiling we could be assoiling you could be assoiling they could be assoiling
Perfect
I could have assoiled you could have assoiled he could have assoiled we could have assoiled you could have assoiled they could have assoiled
V-ing perfect
I could have been assoiling you could have been assoiling he could have been assoiling we could have been assoiling you could have been assoiling they could have been assoiling
Negation
Simple form
I could not assoil you could not assoil he could not assoil we could not assoil you could not assoil they could not assoil
V-ing form
I could not be assoiling you could not be assoiling he could not be assoiling we could not be assoiling you could not be assoiling they could not be assoiling
Perfect
I could not have assoiled you could not have assoiled he could not have assoiled we could not have assoiled you could not have assoiled they could not have assoiled
V-ing perfect
I could not have been assoiling you could not have been assoiling he could not have been assoiling we could not have been assoiling you could not have been assoiling they could not have been assoiling
Interrogative form
Simple form
could I assoil? could you assoil? could he assoil? could we assoil? could you assoil? could they assoil?
V-ing form
could I be assoiling? could you be assoiling? could he be assoiling? could we be assoiling? could you be assoiling? could they be assoiling?
Perfect
could I have assoiled? could you have assoiled? could he have assoiled? could we have assoiled? could you have assoiled? could they have assoiled?
V-ing perfect
could I have been assoiling? could you have been assoiling? could he have been assoiling? could we have been assoiling? could you have been assoiling? could they have been assoiling?
Interro-negative form
Simple form
could I not assoil? could you not assoil? could he not assoil? could we not assoil? could you not assoil? could they not assoil?
V-ing form
could I not be assoiling? could you not be assoiling? could he not be assoiling? could we not be assoiling? could you not be assoiling? could they not be assoiling?
Perfect
could I not have assoiled? could you not have assoiled? could he not have assoiled? could we not have assoiled? could you not have assoiled? could they not have assoiled?
V-ing perfect
could I not have been assoiling? could you not have been assoiling? could he not have been assoiling? could we not have been assoiling? could you not have been assoiling? could they not have been assoiling?