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