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1. What is Jill going to do? She is going to meet some friends.
2. Must she get home at half past ten? Yes,she must.
3. How old is Jill?She is eighteen.
4. Does her father want to give her the key? No, he doesn’t.
5.When must Jill get home? She must get home before a quarter past eleven.
6. Do she and her friends always enjoy themselves? Yes,they do.
What are you going to do? I’m going to have my lunch.
You mustn’t come home late.
You must be home at half past ten.
表示“几岁”，一般由基数词+ year(s) old构成。在口语中，year(s) old往往可以省去，而只用数字表示年龄。如：
She is eighteen. 她18岁。
I can’t get home so early.
