新目标八年级下现在完成时和现在完成进行时.ppt

王五中学 吴四少 I have been cleaning the blackboard for several minutes / since several minutes ago.表示在某一特定时间之前曾经发生过的动作表示在某一特定时间之前曾经发生过的动作, ,或者到这一时间为止已经完成的动作或者到这一时间为止已经完成的动作. .1.现在完成时现在完成时: have + 过去分词过去分词2.现在完成进行时现在完成进行时:have + been +现在分词现在分词（2）在强调指出动作还未结束，还要继续下去。如： Ive been reading this book for two hours, but I havent finished it. 这本书我已读了两个小时了，但我还没读完。 Ive read this book. 我已读完这本书了。（4）现在完成进行时也可表示现在以前这段时间反复发生的事情。如： Weve been seeing each other quite a lot recently. 最近我们经常见面。2时间状语：都可以用for或sinceThey have skated _ .They have been skating _.A three hours agoB for three hours agoC since three hours agoD for three hours E since three hours 16 Different Tenses (动词的动词的16种时态种时态)2. 常见的时间状语： always, often, sometimes, usually, every day, twice a week, now and then等。 但有时时间状语不表示出来。如：We went to see his uncle last year.（2）常用”be going to+动词原形”的结构表示主语的主观想法或打算，如： Were going to have a trip in Hawaii.(2) 常见的时间状语： at this time, at this momentNBA match at this time yesterday.an hour and a half = one and a half hoursHalf the students are girls.Half of four is two.Half of them are boys.(of)Half of + 名词名词, of 有时可省略有时可省略.Half of + 代词代词, of 则不可省略则不可省略!