I.I (you, we, they) must...
(must go and see- must come and...
be in time for work, speak to him on the telephone, listen to the radio today, see them tomorrow morning, give the books back to the library in time, work hard at one’s English, answei letters in time.
have dinner (lunch, supper) with... the new English film, one’s parents.
the new theatre in our street, the new cinema in that street, play a game of chess with... our new school, one’s grandchild, see our new house, play the piano to...
go to bed so early? have a dictation again today? finish the work tonight? translate all these letters today?
stay in town all the summer? begin the work at once?