摘要:Section A:现在完成时 ★现在完成时是由“助动词have(has)+动词过去分词 构成. ★(1)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.常与already.just.yet.ever.never等连用. 例如: ----Have you finished your work yet? ----Yes.I have.I have just finished it. ★注意:在这里要注意already和yet的辨析: ★①already通常用于肯定句. I have already told him. 我已经告诉他了. I have already put it in my suitcase. 我已经把它放进我的手提箱了. ★②yet常用于疑问句和否定句. ----Have you watered the tree yet? 你浇树了吗? ----Yes.I have already watered it. 我浇了. ----Have you fed the dog? 你喂过狗了吗? ----No. I haven’t fed it yet. 没有.我没喂. ★(2)表示过去已经开始.持续到现在的动作或状态.可以和表示从过去某一时刻延续到现在的一段时间的状语连用.如for.since.now.today.this month.this year等. 例如: I have lived here since 1980. 从1980年以来我一直住这儿. I have been at this school for over four years.我已经在这所学校呆了四年多. ★ for和表示一段时间的词组连用.例如:for two minutes.for five hours.for ten days.for three weeks.for fourteen months.for twenty years. ★since和表示过去某一时刻的词或词组连用.例如:since eight o'clock this morning.since last Sunday.since five weeks ago.since October等. Section B:1. Have you packed yet? 你打包了吗? ★(1)这是一个现在完成时的句型.它是在两个时间上.一是过去.一是现在.它的动作发生在过去.但对现在有影响或结果.而这种影响和结果是说话人的兴趣所在.所以常常后面不用时间状语.Have/has+动词的过去分词.是它的基本结构. 例如: Someone has broken the door. 有人把门打破了. She has been ill. 她刚生病了. ★(2)pack 包装.把--装箱 ★pack sth(up)into- 整理行装 例如: Pack clothes into a truck. 把衣服装进衣箱内. ★pack into 塞进.挤进 例如: The children packed into the cinemas on a wet day. 在雨天.孩子们挤进电影院.

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