新人教版英语七年级下册Unit5 语法专项ppt课件(why的用法).ppt

Unit5 语法专项课件（why的用法）,初中英语人教版七年级下册,why的用法1,why是疑问副词，意思是“为什么”，用来询问原因、理由，一般由“Why+一般疑问句”构成特殊疑问句。,why的用法1,Why does he like this subject?Why is she here?,why的用法2,why引导的特殊疑问句，一般由because引导的状语从句来作答。because是连词，意为“因为”，其后要接一个句子来陈述原因、理由。,why的用法2,Why dont you like English?Because its difficult.,Why do they want to go to China?Because they want to learn Chinese.,why的用法3,Why not do sth？=Why dont/didnt you do sth?意为“为什么不做某事？”，用于提出建议、征询意见。根据具体场景来答复对方。,why的用法3,Why dont you go to the zoo with us?Sounds great./Good idea.,why的用法4,why相当于“whatfor”，回答时用because后接表示原因的句子，because of后接名词、代词或词组。,why的用法4,What do you open the window for?=Why do you open the window?Because we need more fresh air.,易错点1,Why are you late again?Because there is something wrong with my bike.,because常回答why引导的疑问句；as，since语气较弱，不回答why引导的问句。,易错点2,because和because of有区别。because后面要跟从句，而because of后面跟名词、代词或短语。,He is late for school because it rains heavily.He is late for school because of the heavy rain.,【典例1】_ does your cousin usually go to work on foot?He says its good for his health.A.Where B.When C.Why D.How,考查疑问词。句意：为什么你堂弟经常步行上班？他说，那对他身体好。答句表示的是原因，故应选用why来提问。,【典例2】Why not _ to the park now?Good idea!Lets go.A.go B.to go C.goes D.going,考查why的用法。句意：为什么现在不去公园呢？好主意，我们走。why not表建议，后跟省to动词不定式，选A。,【典例3】Why not go to Lao She Teahouse tonight?_.A.It doesnt matter B.Thank you C.Sorry to hear that D.Sounds great,考查疑问句及回答。句意：为什么今晚不去老舍茶馆呢？听起来不错呀。表建议的回答，根据实际情况来，选D。,