6.'What am I going to do about a present for the hostess?'
'You can/ have to bring her some flowers.'
7.I don't know what time I'll be home. I can/ have to be quite late, I'm afraid.
8.Before entering a Japanese house, you may/ should take off your shoes.
9.You mustn't/ don't have to conduct any chemistry experiments unless you are wearing safety glasses.
10.Should/ Shall I show you around to see the festival preparations?