2014年秋九年级英语上册 Unit 4 Growing up Grammar课件 （新版）牛津版.ppt

以上我们已经通过归纳总结和练习对本课的语法内容有了一定的了解，下面就让我们根据 之前练习的考察情 况进一步选择讲解 该语法项的重难点。 * since, till和until常用来引导时间状语从句。如： Mr Brown has been in Beijing since you left. 自从你离开，布朗先生就一直待在北京。 I worked till/until he came back. 我一直工作到他回来为止。 * since意思是“自从……以来”。一般情况下，从句谓语动词用一般过去时，而主句的谓语动词用现在完成时。如： 注意：since引导的从句的谓语动词可以是延续性动词，也可以是瞬时动词。 They have been friends since they were at primary school. 他们从小学起就一直是好朋友。 * till和until意思是 “到……为止” ，一般情况下两者可以互换。until可以放在句首或句中，而till不可以用在句首。 注意：如果主句中的谓语动词是瞬时动词时，必须用否定形式，即“not…until”结构，意思是“直到……才（开始）”。如： Walk till/until you see a white house. 一直走到你看到一座白房子为止。 I did not go to bed until I finished my homework. 直到做完作业我才上床睡觉。 * Here are more sentences from David’s diary entry. Complete his sentences with since, till or until. (P55) B 1. I have been crazy about playing basketball ________ I was a little boy. 2. The weather has been awful this week. The rain did not stop ________ yesterday evening, so we could not practise basketball for several years. since until * 3. We played basketball in the playground this afternoon ________ it was getting dark. 4. It is the first time we have played basketball _______ Monday. We enjoyed ourselves very much. 5. I waited for 20 minutes at the bus stop ________ the bus arrived. 6. It is Friday evening. I will not go to bed ________ I finish watching my favourite TV programme. till/until since till/until until * Look at the following sentences. 1. As soon as you click the mouse, there’s a great deal of information.(P49) 2. …and I can read them whenever I want to. (P49) 3. It began to rain as soon as I left the house. (P56) * 1. __________ you click the mouse, there’s a great deal of information.(P49) 2. …and I can read them ___________ I want to. (P49) 3. It began to rain ____________ I left the house. (P56) As soon as whenever as soon as Fill in the blanks. go Ready? * I will send you an e-mail as soon as I ________ in Canada. (2011 北京) A. arrive B. arrived C. am arriving