现在完成时态复习.ppt

现在完成时态的复习,2013年12月,一、现在完成时态的概念,1、现在完成时态表示过去某个时间点开始发生的动作，一直持续到现在。,2、现在完成时态表示过去发生的动作，对现在所造成的影响或结果。,二、现在完成时态的结构,have/has+过去分词,助动词,如：have/has worked have/has arrived have/has studied have/has done,2011-46.()Your English teacher has never lost his temper,_ he?A)has B)hasnt C)did D)didnt,2008-37.()Plastic bags have caused serious environmental pollution,_?A)havent they B)have they C)dont they D)do they,2010-67.Your mother has never tried shopping on the Internet.（改为反义疑问句）Your mother has never tried shopping on the Internet，_ _?,A,A,has,she,三、现在完成时态三种基本的句子种类,1、肯定句,He has worked as a teacher for 3 years.,2、否定句,He hasnt worked as a teacher for 3 years.,3、一般疑问句,Has he worked as a teacher for 3 years?,We have had dinner.,We havent had dinner.,Have you had dinner?,四、现在完成时态的用法（1）,1、现在完成时态表示过去某个时间点开始发生的动作，一直持续到现在。,2010,He began to work as a teacher in 2010.,He has worked as a teacher for 3 years.,3 years,since,2013,for,He has worked as a teacher since 2010.,A：How long has he worked as a teacher?,He has worked as a teacher since he graduated from university(in 2010).,（自从。以来）,用How long提问,B,C,How long,A,D,四、现在完成时态的用法（2）,2、现在完成时态表示过去发生的某一个动 作，对现在所造成的影响或结果。,We have had dinner.,Mike hasnt got to school.,五、现在完成时态的一些注意点,3、瞬间动词和延续性动词的转换,2、have/has been to 和 have/has gone to 的区别,1、already 和yet 的用法,1、already 和yet 的用法,We have already had dinner.,We havent had dinner yet.,Have you had dinner yet?,（already用于肯定句中，一般置于句中，助动词后。）,（yet用于否定句和疑问句中，一般置于句尾。）,2009-40.()I _ you already that washing hands often will help prevent the A-H1N1 Flu.A)tell B)told C)have told D)am telling,C,2、have/has been to 和 have/has gone to 的用法,Shanghai,Beijing,Shanghai,Beijing,They have been to Beijing twice.,他们去过北京两次。,（已经从北京回来）,They have gone to Beijing.,他们去北京了。,（还没有从北京回来）,2007-68.Mr and Mrs Brown have already been to China twice.（对划线部分提问）_ _ times have Mr and Mrs Brown been to China?,How many,2008-70.Junior 3 students began to learn chemistry a year ago.（保持句意基本不变）Junior 3 students _ learned chemistry _a year.,3、瞬间动词和延续性动词的转换,have,for,常见的瞬间动词 延续性动词,begin(began)to do buy(bought)borrow（borrowed）die(died)join(joined)leave(left)become(became),have/has donehave/has hadhave/has kepthave/has been deadhave/has been in/a/anhave/has been awayhave/has been a/an,