外研版八下M2U3现在完成时精要.ppt

I can’t play computer games now, because I haven’t… * 写出下列动词的过去式及过去分词： clean finish enter visit cook travel copy cleaned cleaned finished finished entered entered cooked cooked traveled/travelled traveled/travelled copied copied visited visited pratise water climb wash win see have be find pratised pratised watered watered climbed climbed washed washed won won saw seen had was/were found had been found do sweep read lose take go ride eat did done swept swept read read took taken lost lost went rode ate gone ridden eaten present past They ______________the Pyramids. Two years ago now They saw the Pyramids. They know Pyramids very well . have seen Present Perfect Tense (1)I have entered lots of speaking competitions. I’ve won some prizes. (2) Have you ever won any prizes before? (3) I have never visited the USA. past 现在完成时 ( present perfect tense) present(now) future 以上句子的谓语动词有一个共同的特点就是“__________________________”, 用于表示_____________________________________ _______________________________如(1); 还可以______________________________，如(2)(3)。我们把这种时态称为“现在完成时”。 have/has+动词的过去分词 在以前的某个时间曾经做过的、发生的事情, 这种行为对目前有某种影响 表示到目前为止曾经经历或没经历的事情 现在完成时的构成 　（一）肯定式 I have entered lots of speaking competitions. has have 主语＋助动词have ／has ＋过去分词＋其它 说明：这里的have ／has是助动词，没有什么具体意义。当主语是第三人称单数时助动词用_____，其余人称一律用______。 has，have的缩略式分别为s或ve。 EXERCISES: 1）I______ just _______ all the new words ． 我刚抄写了所有的生词。 (表示不要再抄了) 2）She __________her books ． 她丢失了她的书。 （表示到目前为止还没有找到） 3）We______ just ________ the classroom ．我们刚好打扫了教室。（表明现在教室是干净的） have copied has lost have cleaned (如果用过去时：She lost her books则强调书是过去丢的这一动作，而不知现在有没有找到) Team racing Activity Two teams have a race. The team that first gives a correct sentence gets one point. Speaking Practice I Ready? I/ He/She have/has… win some prizes have a Western meal enter a singing competition travel by train cook dinner for your parents （二）否定式 I have not visited the USA. have ／has not haven’t hasn’t some，already any yet 主语＋助动词have ／has＋not＋过去分词＋其它 说明：现在完成时构成否