学生学案四

Unit 4学案四Ⅰ Teaching aims:1.Help the students understand the whole text well.2.Help the students understand some difficult sentences and master useful points.预习案改错：I have some study tip to share with you. First, be sure to discuss your needs with your teacher. He and she may have great advice for you. Second, in the classroom, be sure to listen careful to your teacher and making notes so that you can review later. Ask questions unless something is unclear. Third, see if you can do your homework soon after arriving to home. That way, things you’ve learned will fresh in your mind. When you do your homework, you are practicing that you’ve learned. At last, if you study and review your notes every day, you will have to struggle to learn many things before a test. And when you do a project, try to work on them a little every day rather than do it all at once.课堂探究案1. to begin with = to start with 以……开始；由……作为开头；首先To begin/start with, I couldn’ t understand a single word. 起初，我一句也没弄明白。

★begin/start with 从……开始begin/start sth with 从……开始……[练习] 1). He ______ his speech ______ a poem.2). His speech ______ ______ a poem.3). ______ ______ ______, pets are good friends of many lonely people, especially the old.2. in time 及时；最终；迟早1). They caught the bus in time. 他们及时赶上了汽车。

2). If you keep on, you will succeed in time. 如果坚持下去，你们总有一天会成功的。

★in no time 立刻；马上at one time 有个时期；曾经；一度at a time 一次；每次at times = sometimes 有时many a time 常常；多次 ahead of time 提前，提早take one’ s time 慢慢来，别急It’ s (high/about) time that sb. did/ should do sth. 是做某事的时候了[练习] 1). They sent the mail to me just _______ _______, before I 1eft.3). Hurry up! The concert will begin _______ _______ _______.7). Don’t try to do everything at once; take it a bit _______ _______ _______.3. in one’ s turn 轮到某人；接着I will see you, each in your turn. 我将要一个接着一个地看你。

★in turn轮流；一个接着一个by turns轮流；一阵……一阵……take turns (to do sth.)轮流（做某物）It’s one’s turn to do sth. 轮到某人做某事了[练习] 1).She went hot and cold _______ _______.2). 我们轮流着开车。

_______________________________________________________________________________3). 今天轮到谁发言了？_______________________________________________________________________________ 4. prevent...from = stop...from = keep....from 使……不做事；阻止……做某事His back injury may prevent him from playing in tomorrow’ s game. 他背部的伤可能使他参加不了明天的比赛。

★【用法辨析】注意: prevent / stop sb. from doing sth.中的from可省, keep sb. from doing sth.中from不可省略，因为keep sb. doing sth.是“使某人一直做某事”之意；但如在被动语态中，三者的from都不可省；当后接sb’ s doing sth. 作宾语时，只能用prevent或stop，不能用keep，因为没有keep sb’ s doing sth. 的句型。

[练习] 根据句子的意思完成句子或翻译。

1). Doctors took action to _______ _______ _______ _______ _______ (防止这种疾病的蔓延).2). Of course I can’ t _______ your going abroad.3). 警察阻止他们携带武器。

_______________________________________________________________________________ 5. block out 挡住（光线）That wall blocks out all the light. 那堵墙把光线都遮住了。

★come out 出现，显露；出版，结果是pick out挑出，辨认出，分辨出turn out 结果证明是check out 结帐离去，办妥手续离去give out 分发；用完，消耗尽；发出(光、声音等)[练习] 1). At the end of the race his legs _______ _______ and he collapsed on the ground.2). It’ s easy to _______ him _______ in a crowd because he is very tall.3). His nwe book will _______ _______ next month.4). We thought it was going to rain; it _______ _______ to be a find day.5). We _______ _______ of/from our hotel at 5 a.m. to catch a 7 a.m. flight.6. be off = set off 出发；动身；不用上班/学/开张Then we were off. 随后我们就启程了。

★keep off 远离pay off 付清，还清[练习] 1). It is a Sunday and we _______ _______ (不用上班) today.2). Her husband _______ _______ on a business trip somewhere.3). There we saw a sign reading, “_______ _______ the grass”.4). After ten years of hard work, she finally _______ _______ all her debts.7. break out (灾难、战争等) 突发；爆发Fire broke out during the night. 夜间突然发生了火灾。

★break down毁掉；坏掉；(计划/谈判)失败break up打碎；拆散；(会议)结束；分裂(解体) break into sth. 强行进入某处[练习] 1). A terrible tsunami _______ _______ in the southeastern countries of Asia at Christmas, 2004.2). When do you _______ _______ for Christmas?3). Negotiations between the two sides have _______ _______.4). His house was _______ _______ last week.8. watch out 密切注视；当心；提防Watch out! There’ s a car coming. 小心! 汽车来了。

★watch out for sb/sth 警惕或注意某人/事物watch over 保护；照看[练习] 用watch短语填空。

1). There must have been an angel _______ _______ me that day.2). What problems should I _______ _______ _______ when buying an old house?3). You’ll become an alcoholic if you don’ t _______ _______.9.remain/leaveremain vi. 仍然是；留下；剩下常用句型：remain + n. 仍然是remain + adj./adv./prep. 仍然是remain + v-ed/v-ing 仍然是remain to be done有待去做，依然要做leave vt. 剩下，忽略或未拿或未带（某物），使或让（某人、事物）处某状态﹑某地等常用句型：leave sb. sth. / leave sth. to sb. 给某人留下某物leave sth (for sb) 留下，交待下(某物) leave sth to sb 将某物遗赠给某人remaining/left两者都可以作形容词，表示“剩下的”，前者用于被修饰的名词之前，后者用于被修饰的名词之后。