(教材P28)We cannot leave out the question words in noun clauses.在名词性从句中，我们不能漏掉疑问词。

　　leave for...　 动身去......

　　leave aside 不予考虑，搁置一边

　　leave ...behind 把......抛在后面，超过

　　leave off 停止(做某事)，中断

　　leave alone 不管；不理；不干涉

　　①The principal is busy at his desk.You'd better leave him alone.

　　校长正坐在桌旁忙于工作。你最好别打扰他。

　　②Start reading from where you left off last time.

　　从你上次停下来的地方接着读吧。

　　③What if the family had simply left the cat behind?

　　要是这家人只不过是把这只猫丢下的会怎么样呢？

　　 concern n．关心；忧虑

　　vt.涉及；使担忧；对......感兴趣

　　(教材P29)King Henry Ⅶ was a poet who showed great concern for language.

　　国王亨利七世是一位诗人，对语言非常感兴趣。

　　(1)feel/show concern about/for/over...

　　 对......表示关心/担心

　　(2)concern oneself about... 担心......

　　(3)concerned adj. 关注的，关切的；担心的；涉及的

　　be concerned about/for 担心......

　　be concerned with/in 涉及/有关

　　as far as...is concerned 就......而言

　　(4)concerning prep. 有关，关于

　　①He didn't concern himself about the details.

　　他不关心细节。

②It is natural that we are concerned about our daughter's safety.我们担心女儿的安全，这很自然。