必修4---unit 4.ppt

They shook hands and then kissed each other twice on each cheek，since that is the French custom when adults meet people they know.两个人握了握手，并且在对方的面颊上吻了两下。通常，法国成年人见到熟人就是这么做的。 since为从属连词，引导原因状语从句。they know 为定语从句修饰people。例如： Great changes have taken place in the past few years since he left. 自从他离开后近几年发生了巨大变化。 Since you wouldnt listen，how can you learn anything? 你不听，怎么能学到东西呢？ since用法小结： (1)conj.自……以来，引导时间状语从句。 (2)conj.既然，引导原因状语从句。 (3)prep.自……以来，后接名词、代词或动名词， 和现在完成时连用。 (4)adv.自……以来，后面不跟具体时间点，也可用 ever since, ever since then。 since常用于It is/has been＋一段时间＋since ＋一般过去时态中。当since从句中动词为非延续性动词时表示“自……以来多长时间了”；若为延续性动词，则表示“自从不……以来已经多长时间了”。 Its three years since I began to work here. 我在这儿上班已三年了。 Its three years since I worked here. 我不在这儿上班已经三年了。 Not all cultures greet each other the same way，nor are they comfortable in the same way with touching or distance between people.各种文化背景下人们互致问候的方式不尽相同，身体接触和相互间距离的程度也并不一样。 这个句子是由一个中心词组not ...nor ...连接起来的，意为“既不……也不……”。部分否定通常由not＋ all/both/each/everybody/everything等来表达。 并不总是用这种方式表达部分否定，有时也以一般否定句的形式出现，即把否定主语的not与谓语动词放在一起。 Not every Welshman speaks Welsh. 并不是每个威尔士人都说威尔士语。 All is not gold that glisters.发光的并不都是金子。 若要表示全部否定，则应用相应的表示全部否定的否定词。 all→none (一个人也没有、没有任何东西); both→neither (两个都不)；every→no (没有，不是)；everyone→no one(没有人)；everything→nothing (什么也没有)等。 I like neither of the books.这两本书我都不喜欢。 —________when has the country been open to international trade? —1978，I suppose. A．From B．In C．Since D．After 答案：C (2012年九江检测)—I think the whole class is going on a field trip next Friday. —Im not sure.________has paid the transportation fee. A．Not everyone B．No one C．None of them D．Neither of us 答案：A 1． 2. (2012年宁海模拟)Later, I realized that I didnt know his name or the least bit about him，________intend to ask. A．nor I did B．I did not C．nor did I D．either did I 答案：C (2012年长春外国语学校质检)Lots of rescue workers were working around the clock，________supplies to Yushu, Qinghai Province after the earthquake. A．sending B．to send C．having sent D．to h