初中-英语-外研版-九年级上册-Unit 2典案三 PPT教学案例.ppt

come round 拜访（某人的家） She knew I wanted to try the boat out at the weekend. 她知道我周末想幵船出去试一下。 拓展： try out for报名参加；竞争；争取参加；参加选拔 His brother’s example inspired him to try out for the football team. 他哥哥的榜样激励他去接受足球队的选拔测试。 5. I’m not sure whether a computer engineer can get the documents back. 我不知道电脑工程师是否可以将那些文件找回来。 (1).引导宾语从句，一般既可用whether也可用if。但句中含有or not时能用whether不用if。 I don’t know whether or not he will come.我不知道他是不是会来。 (2).如果or not 放在whether所引导的从句句尾，则可以用if替换。 I don’t know whether/if he will come or not. 我不知道他是不是会回来。 (3). 在强调任意选择时，用whether…or,此时不用if 替代whether. He asked me whether1 wanted to go there by train or by bus. 他问我想乘火车还是坐公共汽车去那里。 注: whether…or 一起还有“不管”之意，引导让步状语从句。 ⑷.只用whether不用if的情况。 强调宾语部分，也可把从句放在句首。 Whether he will come I am not sure. 他是不是来我拿不准。 作介词宾语时，如： It depends on whether it will be fine. 那得看是不是晴天。 作discuss等动词的宾语时。 We discussed whether we should close the shop.我们讨论是不是该关掉商店 句子中有if引导的条件句,如再有表示“是否”的宾语从句，用whether 不用if。 He asked me whether I’d love to move to New York if I got the job 他问我如果得到那份工作是否会搬家到纽约。 在动词不定式之前用whether 不用if. I dont know whether to go there at once. 我不知道是不是该立刻去那里。 容易产生歧义时用whether不用表示“是否”。 Please let me know if you need help. 如果你需要帮助请告诉我。或：请告诉我你是否需要帮助。 对比:Please let me know whether you need help.请告诉我你是否需要帮助。 (5). 在引导主语从句，表语从句，同位语从句时一般用whether 不用if. Whether it is true remains a question. (主语从句）那是不是真的仍然是个问题。 The question is whether it is true. ( 表语从句）问题是那是不是真的。 We have a doubt whether it is true (同位语从句)我们怀疑那是不是真的。 注:whether 引导主语从句放在主语之后时可用if来代替。 It is unclear whether/if he likes the present. 他是不是喜欢那个礼物还不清楚。 6. take off (1). 脱下; 移去 He took off his raincoat. 他脱下雨衣。 (2). 起飞 The plane will take off soon. 飞机马上就要起飞了。 Steve’s problem a). Steve and his friend played a computer game on his father’s computer, though his father warned him not to do so. Steve’s father was really angry. b). Steve’s friend took out some documents by mistake from Steve’s father’s computer. His father was very angry. Steve did not know how