I could effuse you could effuse she could effuse we could effuse you could effuse they could effuse
V-ing form
I could be effusing you could be effusing she could be effusing we could be effusing you could be effusing they could be effusing
Perfect
I could have effused you could have effused she 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 she could have been effusing we could have been effusing you could have been effusing they could have been effusing
Negation
Simple form
I couldn't effuse you couldn't effuse she couldn't effuse we couldn't effuse you couldn't effuse they couldn't effuse
V-ing form
I couldn't be effusing you couldn't be effusing she couldn't be effusing we couldn't be effusing you couldn't be effusing they couldn't be effusing
Perfect
I couldn't have effused you couldn't have effused she couldn't have effused we couldn't have effused you couldn't have effused they couldn't have effused
V-ing perfect
I couldn't have been effusing you couldn't have been effusing she couldn't have been effusing we couldn't have been effusing you couldn't have been effusing they couldn't have been effusing
Interrogative form
Simple form
could I effuse? could you effuse? could she effuse? could we effuse? could you effuse? could they effuse?
V-ing form
could I be effusing? could you be effusing? could she be effusing? could we be effusing? could you be effusing? could they be effusing?
Perfect
could I have effused? could you have effused? could she 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 she have been effusing? could we have been effusing? could you have been effusing? could they have been effusing?
Interro-negative form
Simple form
couldn't I effuse? couldn't you effuse? couldn't she effuse? couldn't we effuse? couldn't you effuse? couldn't they effuse?
V-ing form
couldn't I be effusing? couldn't you be effusing? couldn't she be effusing? couldn't we be effusing? couldn't you be effusing? couldn't they be effusing?
Perfect
couldn't I have effused? couldn't you have effused? couldn't she have effused? couldn't we have effused? couldn't you have effused? couldn't they have effused?
V-ing perfect
couldn't I have been effusing? couldn't you have been effusing? couldn't she have been effusing? couldn't we have been effusing? couldn't you have been effusing? couldn't they have been effusing?