现在完成时构成：现在完成时由havehas动词的过去分词.ppt

现在完成时 构成:现在完成时由“have/has+ 动词的过去分词”构成。 现在完成时的肯定式、否定式和疑问式及简单回答形式（以动词study为例）： 肯定式：I （You）have　studied. He(She, It) has studied. We(You,They) have studied. 否定式I(You) have not/haven’t studied. He(She,It)has not/hasn’t studied. We(You,They) have not/ haven’t studied. 疑问式：Have I( you ) studied? Yes, you (I) have./No,you (I) haven’t. Has he (she,it) studied? 　Yes,he(she,it) has.／No,he(she,it) hasn’t. Have we(you,they) studied? Yes, you (we,they) have. No,you (we,they) haven’t. (2)动词的过去分词：规则与不规则 你还记得过去式吗？ 你能写出下列单词的过去分词吗？ be--- finish--- live--- invite--- see--- paint--- -help--- like--- tell--- study--- stop--- hate--- make--- lugh--- learn--- play--- write--- say--- Have- 请用两个单词分别写现在完成时的肯定句，否定句和疑问句。 I have written my postcard. I haven’t written my postcard. Have you written your postcard? Yes, I have. / No,I haven’t 你写对了吗？ 练一练 用完成时完成下列句子 1。The room is cold。Who——————（open）the window？ 2。He———（go）to the cinema。 3。—you——（put）away my dictionary? 4.We________(not finish) the work yet. 5.I________(see) the play. I _____(see) it last month with my sister. 6.I am not hungry.I ____just____(have) my dinner. (3) 用法 Ａ表示过去发生或已经完成的某一动作对现在造成的影响或结果。例如： I have opened the window.我已经把窗户打开了。（窗户是开着的） The concert has started.音乐会已经开始（音乐会现在在进行） They have gone to Shanghai.他们已去上海了（他们不在这里） 现在完成时不能和表示过去的时间状语，如yesterday,last year,in 1980,three days ago Just now,when I came in等连用。但可以和一些不确定的时间状语，如already,yet Sometimes,often,before,lately,once,never, Just,ever 等连用；也可以和包括现在在内的时间状语，如this morning, today, this Week, this year等连用。例如 She has already come.她已经来了。 I haven’t read it yet.我还没有读过这个 Have you ever seen each other bef