Mid-Autumn Festival is the second most traditional festival in China.

　　中秋节是中国第二大传统节日。

　　【知识归纳】

　　"the/one's+序数词+biggest/highest/longest"意思是"第......大/高/长......"。

　　4.now that由于，既然

　　【典型例句】

　　Now (that) John has arrived,we can begin.

　　既然约翰已到，我们可以开始了。

　　Now (that) you are a big boy,don't do such a thing.

　　既然你已是个大男孩，那就不要做这种事了。

　　【相关链接】

　　表示原因的连词

语气 位置 意义 例句 because 最强 主句之前或单独存在 回答why的提问；表直接原因 I was angry because he was late.

-Why can't I go?

-Because you're too young. since 较强 通常位于主句之前 表示已知的或显然的理由；侧重主句 Since everyone is here,let's start.

Since you can't answer the question,I'll ask someone else. as 较弱 通常位于主句前 由于；鉴于；主从并重，从句说明原因，主句说明结果；把众人所知的事实当作理由 As it was late,I made haste to go.

As she has no car,she can't get there easily.

for 最弱 位于主句后 表明推断或附加的理由；引导分句前常有逗号 He must be ill,for he is absent today. 　　说明：①because,since,as都是从属连词，引导原因状语从句；而for为并列连词，引导并列分句。

　　②now (that)用法同since。

　　5.Is it possible to do...做......是有可能的

　　【典型例句】

　　It is possible for him to solve the problem.

　　他可能解决那个问题。

　　【知识归纳】

该句式"It be (is/was) possible (for sb.) to do sth."意思是"干某事有可能"，是it作形式主语，不定式作真正主语的句子。