2019年春八年级英语下册Module9Friendship模块语法专练课件 7页

语法精讲 whether/if及疑问词引导的宾语从句 1.whether/if引导的宾语从句。 ( 1 )whether/if引导宾语从句时,意为“是否”,表示不确定的概念,常位于 ask,see,say,know,find out等词或短语后面。一般情况下,两者可互换,在口语中多用if。例 如: He asked if/whether they needed some help.他问他们是否需要帮助。 ( 2 )whether和if的区别。 ①在动词不定式之前只能用whether。例如: I can’t decide whether to stay.我不能决定是否留下。 ②在固定结构“whether...or not”中,只能用 whether。例如: I want to know whether it’s good news or not.我想知道它是否是个好消息。 ③在介词后只能用whether。例如: His father is worried about whether he may lose his job.他的父亲担心他是否会失去工作。 语法精讲 2.疑问词引导的宾语从句。 ( 1 )由特殊疑问句充当宾语从句时,该从句由特殊疑问词引导,此从句要用陈述句的 语序。例如: I don’t know when the plane flies.我不知道飞机什么时候起飞。 ( 2 )当宾语从句由连接副词或代词when,where,who,why,which,what,whose等引导时, 有时可以改为由“疑问词+动词不定式”构成的不定式短语,使宾语从句转化为简单句。 但前提是主句的主语与从句的主语一致或主句的宾语是从句的主语。例如: Can you tell me how I can get to the bus stop? →Can you tell me how to get to the bus stop?你能告诉我怎样去公交车站吗? 语法精练 Ⅰ.单项填空 ( C )1.—I wonder　　　　.  —Yes,of course. A.where we can buy the parts B.how often you hear form your sister C.if I may have a word with you D.why he arrived late yesterday ( A )2.—What did he ask just now? —He wondered　　　　.  A.if they would meet at the school gate B.when would they start C.that they would take some food D.how they will get there 语法精练 ( D )3.I wonder　　　　the idea to Daming.He still looks angry.  A.if have you mentioned B.what have you mentioned C.what you have mentioned D.if you have mentioned ( B )4.—Do you know　　　　we will arrive at your home town?  —This afternoon. A.why B.when C.if D.where ( C )5.My grandmother always asks me　　　　.  A.why can she use the iPad B.how can she use the iPad C.how she can use the iPad D.when can she use the iPad 语法精练 Ⅱ.用适当的引导词填空 1.—Could you tell me　how　people celebrate the Dragon Boat Festival in China?  —Sure.People usually watch the dragon boat races and eat zongzi. 2.—I’m waiting for the mail.Do you know　when　it will arrive?  —Usually it comes by 4:00 pm. 3.—Excuse me.I wonder　if/whether　there is a bus here to go to Downing Street.  —Yes.Bus No.223. 4.—Could you tell me　what　he said at the meeting?  —Sorry,I didn’t go to the meeting. 语法精练 Ⅲ.将下列句子改为含有宾语从句的复合句,每空一词 1.When did the train leave?I wanted to know. I wanted to know　when　the train　left　.  2.Are there many people at the party?I didn’t know. I didn’t know　if/whether　 　there　 　were　many people at the party.  3.Does it cost much money to fly to Beijing?Could you tell me? Could you tell me　if/whether　it　costs　much money to fly to Beijing?  4.Who invented TV set?I don’t know. I don’t know　who　 　invented　TV set.  5.Does the girl need any help?He asked me. He asked me　if/whether　the girl　needed　some help.