I could except you could except he could except we could except you could except they could except
V-ing form
I could be excepting you could be excepting he could be excepting we could be excepting you could be excepting they could be excepting
Perfect
I could have excepted you could have excepted he could have excepted we could have excepted you could have excepted they could have excepted
V-ing perfect
I could have been excepting you could have been excepting he could have been excepting we could have been excepting you could have been excepting they could have been excepting
Negation
Simple form
I couldn't except you couldn't except he couldn't except we couldn't except you couldn't except they couldn't except
V-ing form
I couldn't be excepting you couldn't be excepting he couldn't be excepting we couldn't be excepting you couldn't be excepting they couldn't be excepting
Perfect
I couldn't have excepted you couldn't have excepted he couldn't have excepted we couldn't have excepted you couldn't have excepted they couldn't have excepted
V-ing perfect
I couldn't have been excepting you couldn't have been excepting he couldn't have been excepting we couldn't have been excepting you couldn't have been excepting they couldn't have been excepting
Interrogative form
Simple form
could I except? could you except? could he except? could we except? could you except? could they except?
V-ing form
could I be excepting? could you be excepting? could he be excepting? could we be excepting? could you be excepting? could they be excepting?
Perfect
could I have excepted? could you have excepted? could he have excepted? could we have excepted? could you have excepted? could they have excepted?
V-ing perfect
could I have been excepting? could you have been excepting? could he have been excepting? could we have been excepting? could you have been excepting? could they have been excepting?
Interro-negative form
Simple form
couldn't I except? couldn't you except? couldn't he except? couldn't we except? couldn't you except? couldn't they except?
V-ing form
couldn't I be excepting? couldn't you be excepting? couldn't he be excepting? couldn't we be excepting? couldn't you be excepting? couldn't they be excepting?
Perfect
couldn't I have excepted? couldn't you have excepted? couldn't he have excepted? couldn't we have excepted? couldn't you have excepted? couldn't they have excepted?
V-ing perfect
couldn't I have been excepting? couldn't you have been excepting? couldn't he have been excepting? couldn't we have been excepting? couldn't you have been excepting? couldn't they have been excepting?