I could effuse you could effuse he could effuse we could effuse you could effuse they could effuse
V-ing form
I could be effusing you could be effusing he could be effusing we could be effusing you could be effusing they could be effusing
Perfect
I could have effused you could have effused he could have effused we could have effused you could have effused they could have effused
V-ing perfect
I could have been effusing you could have been effusing he could have been effusing we could have been effusing you could have been effusing they could have been effusing
Negation
Simple form
I could not effuse you could not effuse he could not effuse we could not effuse you could not effuse they could not effuse
V-ing form
I could not be effusing you could not be effusing he could not be effusing we could not be effusing you could not be effusing they could not be effusing
Perfect
I could not have effused you could not have effused he could not have effused we could not have effused you could not have effused they could not have effused
V-ing perfect
I could not have been effusing you could not have been effusing he could not have been effusing we could not have been effusing you could not have been effusing they could not have been effusing
Interrogative form
Simple form
could I effuse? could you effuse? could he effuse? could we effuse? could you effuse? could they effuse?
V-ing form
could I be effusing? could you be effusing? could he be effusing? could we be effusing? could you be effusing? could they be effusing?
Perfect
could I have effused? could you have effused? could he have effused? could we have effused? could you have effused? could they have effused?
V-ing perfect
could I have been effusing? could you have been effusing? could he have been effusing? could we have been effusing? could you have been effusing? could they have been effusing?
Interro-negative form
Simple form
could I not effuse? could you not effuse? could he not effuse? could we not effuse? could you not effuse? could they not effuse?
V-ing form
could I not be effusing? could you not be effusing? could he not be effusing? could we not be effusing? could you not be effusing? could they not be effusing?
Perfect
could I not have effused? could you not have effused? could he not have effused? could we not have effused? could you not have effused? could they not have effused?
V-ing perfect
could I not have been effusing? could you not have been effusing? could he not have been effusing? could we not have been effusing? could you not have been effusing? could they not have been effusing?