【原创】九上for和since的用法区别.pptVIP

Unit 1 The Changing World Topic 3 The world has changed for the better . Section A 1.You have been in New York for a long time. for a long time came to New York present past sb. have/ has been in... 某人一直在…… e.g. I have been in the new school __________. for two years two years ago present past for + 一段时间 for two years ..., but the city has improved a lot since I came here a few years ago. since I came here a few years ago came here present past since +从句（从句谓语动词用过去式） e.g. She has worked in the school ___________. since 2010 2010 present past since +时间点 since 2010 e.g. He has waited for Tom _________________. since two hours ago 8:00 present past since + 一段时间+ago 10:00 since two hours ago I have worked in the school for ten years . =I have worked in the school since ten years ago . =I have worked in the school since 2010. =I have worked here since I came to the school . for+时间段 since+时间段+ago since+时间点 since+从句 since/for用法归纳： Complete the sentences with since or for. 1. You have been in New York _____ a long time. 2. The city has improved a lot _____ I came here a few years ago. for since 3 Look carefully and think about the differences between since and for in 1a. Then complete the sentences with since or for and listen and check. 1.I have lived in Beijing ______ three years. ______2011. 2. He has waited for Tom ______ two hours ago. ______ two hours. 3. We have learned chemistry ___ one month. ____ the new term began. for for for since since since n.化学 n.学期 一、have been to/have gone to have + done 二、句子中出现以下标志性的词汇： already, yet, never…before, just, ever… 参见课本P15. 三、for + 一段时间 since + 现在完成时用法总结 从句 时间点 一段时间+ago 一、have been to/have gone to -- I called you but no one answered. -- Oh, I ___________ the park with my