重点讲解：
1. go ahead 进行；
Go ahead! There's nothing to be afraid of.
干吧！没有什么可怕的。
2. used to do sth. 过去常常；过去曾；
There is no doubt that the relationship between family members is not as close as it used to be.
毫无疑问，家庭成员之间的关系已经不像以前那么亲密。
3. get along with （与…）和睦相处；
I want to get along with everyone.
我想和大家和睦相处。
4. be good for 有利的；有益的；
The healthful air at the seaside is good for you.
海边健康的空气对你有好处。

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