Unit 2 In the lab课件（PPT 55页）.ppt

Unit 2 In the lab Lesson 5-8 一、交际用语 1）Dos and Donts. 2）Thats not allowed. 3）Are we allowed to use the basin？ 4）Follow the teachers instructions. 5）What about…？ 6） Make sure the electricity is turned off and the windows are shut. 二、单词与词组 1）the chemistry lab 2）first of all 3）turn off 4）shut 5）by the side of… 三、句型 1）Once you’re in here， listen to your teacher. 2）Dont touch anything unless your teacher tells you to. 1.Dos and Donts. Dos和Donts是助动词Do和Dont的复数形式，意思为要和不要。汉语中就有七不（seven donts）。例如： Dont spit（不随地吐痰）. Dont swear（不说脏话、粗话）. Dont smoke（不在公共场所吸烟）. 注意：在英语中，本身不具有复数形式的词，在必要时，可在词尾加s或 s，使之变成复数形式。例如： You use too many thiss in your spoken English.在你的口语中，你使用了太多的this。 There are two l’ s in the word tall. tall这个单词中有两个l。 It happened in 1960s/1960’ s. 2.Thats not allowed. Are we allowed to…？ Allow，动词，意思为允许，后面可接名词、代词或动词不定式短语，allow sb. to do sth.意思为允许某人做某事。例如： You shouldnt allow such a thing（to happen）. The teacher didnt allow the boys to play football during break. allow也可用于被动语态中，be allowed to do sth.意思为被允许做某事，可以做某事（=may do…）。例如： The two girls were not allowed to join in the party because they were still too young. 3.What about…？ What/How about…？常用于征求对方意见或提出建议等，后面可接名词、介词、副词、动名词以及从句等。例如： What about next/now？ What about going to swim this afternoon？ 4.Make sure… make sure表示务必、确信、弄明白，后面常接 of/about sth.或that引导的宾语从句。例如： Make sure（that） you will arrive there on time. I know theres a train this afternoon， but I must make sure of the time我知道今天下午有班火车，但我必须弄清楚（发车）时间。 注意：make sure后通常不接不定式。 误：Make sure to shut the windows. 正：Make sure that you shut the windows. 正：Make sure that the windows are shut. 1.first of all first of all意思为首先，最重要的，是first的强调形式，常用于句首。例如： First of all， I’ d like to say how glad I’m here. I have a lot to say，but first of all，I want to thank you for your warm welcome. 注意和at first的区别： at first意为开始，起初，相当于 at the beginning，通常指某事刚发生时的情况，但后来往往发生了变化。例如： At first he knew nobody here， but now he has made a lot of friends. 2. turn off turn