②concern n. 负责的事，担心，关心

常用结构：

①be concerned about/for 关心，挂念，担心

②be concerned with 关切的，感兴趣的，关心的

I'm not concerned with what our enemies know. 我不关心我们的敌人知道什么。

③have no concern for... 漠不关心

We're all concerned for her safety. 我们都为她的安全担忧。

④have no concern with... 和...毫无关系

⑤as far as sb. Be concerned 就...而言，依某人之见

7. make sure 弄明白，确保

归纳拓展：

①make sure of 尽力做到，保证，查明无误，确信，有把握

②for sure 肯定，确定

I think he lives there but I couldn't stay for sure. 我认为他住在那儿，但我不敢确定。

③be sure of/about 确信，对...有把握

I am pretty sure about one thing - it will probably be the most worthwhile.

有一点是可以肯定的-它将是我做过的一件最值得做的事。

④be sure that... 确信，肯定

8. turn one's back on 不理睬，拒绝

He simply turned his back on them and never gave it a second thought.

他直接拒绝了他们，再也没有重新考虑一下。

归纳拓展：

①turn against 背叛，反对

②turn away 拒绝，走开

③turn down 拒绝

④turn up 出现，露面

⑤turn out 生产，出现，证明是，结果是

⑥turn to (sb.) 转向（某人），向（某人）求助

⑦turn over 翻过来，翻阅

9. where引导定语从句

易混辨析：

Where: 相当于"介词+先行词"，在从句中作地点状语。

Which: 指代先行词，在从句中作主语，宾语等。

例：He comes from a Shandong village where his parents were farmers.

他来自山东省的一个小村庄，他的父母都是农民。

This is the museum which we visited last week. 这就是我们上周参观过的博物馆。

10. that+同位语从句