I could enthuse you could enthuse she could enthuse we could enthuse you could enthuse they could enthuse
V-ing form
I could be enthusing you could be enthusing she could be enthusing we could be enthusing you could be enthusing they could be enthusing
Perfect
I could have enthused you could have enthused she could have enthused we could have enthused you could have enthused they could have enthused
V-ing perfect
I could have been enthusing you could have been enthusing she could have been enthusing we could have been enthusing you could have been enthusing they could have been enthusing
Negation
Simple form
I could not enthuse you could not enthuse she could not enthuse we could not enthuse you could not enthuse they could not enthuse
V-ing form
I could not be enthusing you could not be enthusing she could not be enthusing we could not be enthusing you could not be enthusing they could not be enthusing
Perfect
I could not have enthused you could not have enthused she could not have enthused we could not have enthused you could not have enthused they could not have enthused
V-ing perfect
I could not have been enthusing you could not have been enthusing she could not have been enthusing we could not have been enthusing you could not have been enthusing they could not have been enthusing
Interrogative form
Simple form
could I enthuse? could you enthuse? could she enthuse? could we enthuse? could you enthuse? could they enthuse?
V-ing form
could I be enthusing? could you be enthusing? could she be enthusing? could we be enthusing? could you be enthusing? could they be enthusing?
Perfect
could I have enthused? could you have enthused? could she have enthused? could we have enthused? could you have enthused? could they have enthused?
V-ing perfect
could I have been enthusing? could you have been enthusing? could she have been enthusing? could we have been enthusing? could you have been enthusing? could they have been enthusing?
Interro-negative form
Simple form
could I not enthuse? could you not enthuse? could she not enthuse? could we not enthuse? could you not enthuse? could they not enthuse?
V-ing form
could I not be enthusing? could you not be enthusing? could she not be enthusing? could we not be enthusing? could you not be enthusing? could they not be enthusing?
Perfect
could I not have enthused? could you not have enthused? could she not have enthused? could we not have enthused? could you not have enthused? could they not have enthused?
V-ing perfect
could I not have been enthusing? could you not have been enthusing? could she not have been enthusing? could we not have been enthusing? could you not have been enthusing? could they not have been enthusing?