复习10,11,12.ppt

Present Perfect Tense Meaning: 1. Sth happened in the past and had effect till now; 2. Sth happened in the past and will last to future; Form: -ed: C have been (to)和have gone (to)的区别： ★have / has been (to) 表示“曾经到过某地”，说 话时此人不在那里，已经回来。侧重指经历。 ★have / has gone (to) 表示某人“已经去某地了”， 说话时此人可能在路上或已到那里，现在不在 这里。 试比较： He has been to Beijing. 他曾去过北京。 （人已回来，可能在这儿） He has gone to Beijing. 他已经去北京了。 （人已走，不在这儿）。 Time phrases: e.g.: ① I have never heard of that before. ② Have you ever ridden a horse? ③ She has already finished the work. ④ Have you milked the cow yet? Yes, I have done that already. ⑤ I’ve just lost my math book. ⑥ They have watched the film many times. Fill in the blanks with “already, ever, just, yet” e.g. Have you _____been to Japan? I have _____ finished my homework. I have ________finished my homework. I haven’t finished my homework ____. yet: is usually in neg and inter sentences at the end. Neg. I haven’t … yet. Inter. Have you …yet? 2. for + a period of time: since + a point time: since + past tense(从句） 注意: 1. for 和since 所引导的时间状语都表示一段时间.对划线部分提问都用How long. He has been away since last week. He has been away for one week. 2. for+段时间可以转换成since+点时间或表示过去动作的句子 3. 现在完成时对动词的要求 1). With time adv.---already, yet, never, ever, before, just, recently, lately…----any verb is OK. e.g. He has left Xiamen. The film has begun. We have bought a new house. 2. With period of time connected with “for” “since”, you can only use last verb---study, have, keep, be away, be awake, be up, be in …you must change point verb into last verb. e.g. I have done my homework for two hours. They have played the games for the whole day. * 1. Regular 2. Irregular finish--finished--finished live--lived--lived carry--carried--carried stop—stopped--stopped go—went—gone; see---saw—seen forget—forgot—forgotten freeze – froze –frozen; hide– hid -- hidden have (h