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重点讲解：
1. be about to do sth. 即将（做…）的；快要（发生…）的；
I was just about to ask you the same thing.
我刚才正要问你同一件事情。
2. be based on 以…为基础；
Many pictures have been based on simple geometric designs.
许多画都是基于简单的几何图案。
3. used to do sth. 过去常常；过去曾；
We used to go sailing on the lake in summer.
从前的夏天，我们经常泛舟湖上。
4. replace A with B 用B代替A；
In the long-term it may be necessary to try and replace the old habit with a new one.
长远来看，尝试用一个新习惯代替旧习惯可能是必要的。
