牛津深圳版八年级英语（上册）课件Unit1Encyclopaedias(共43张PPT).ppt

【辨析】but与however 　　（1）从词性上来看，but作并列连词，而however作副词。 　　（2）从语序上来看，but位于它所引出的分句之首，而however可以位于分句之首或之后，并通常用逗号将其与分句隔开。 【应用】 (1) Learning playing the guitar isn’t difficult, __________ (but, however) you have to practise it a lot. (2) It was raining heavily, ___________ (but, however), we went out to look for the lost boy. but however 【10】suddenly　adv. happening unexpectedly突然； 忽然 　　Suddenly, all the dinosaurs died out. 突然间，所有的恐龙都灭绝了。 【同根词】 　　sudden adj. 突然的 　　He was shocked by the sudden accident. 他被这个突如其来的事故给惊住了。 【拓展】 　　suddenly=all of a sudden 　　Then, all of a sudden, the first star began to shine. 然后，出乎意料地，第一颗星星开始闪耀了。 【应用】 (　　)All of a sudden, my dog started to bark aloud. (选出可以替换画线部分的最佳选项) 　　A. In the end B. At first C. Suddenly C 【11】win v. attain success or reach a desired goal (在比赛中)获胜；赢 　　My dream is to win a champion in the Olympics. 我的梦想是在奥运会中拿到冠军。 【拓展】 　　(1) win的过去式为won,过去分词为won。 　　I won the game last night. 昨天晚上我赢得了比赛。 　　(2) win的近义词为beat和defeat。 　　We were defeated in the football match last month.上个月我们的足球赛踢输了。 【辨析】win, defeat与beat 　　(1) win 一般指“赢得比赛、奖项，或战争、选举胜利等”，常见搭配如下： 　　win a game(match)/race/prize/war 赢得比赛/赛跑/奖项/战争胜利 　　(2) defeat通常可与beat互换，均表示“战胜或击败对手”，常见搭配如下： 　　defeat/beat the enemy/team 打败敌人/队伍 　　(3) beat除了表示“击败”可与defeat互换以外，还可以表示“打击；跳动”。 　　I was really nervous, and my heart was beating very fast. 我很紧张，心跳得很快。 【应用】用win， defeat或beat填空 (1) The army _____________ the enemy in the end. (2) Who do you think will _____________ the next election? (3) Mark is learning how to _____________ a drum. beat/defeated win beat 【12】as...as和……一样 　 My bag is as heavy as yours. 我的书包和你的一样重。 【拓展】 　　省略号处一般用形容词或副词的原级。 　　Mary spoke as fast as Tom did. 玛丽说得和汤姆一样快。 【应用】 You should read as __________ (care) as Lily in order to make fewer mistakes. carefully 【13】die out（of a family, species, etc.）no longer have any members left alive（指家族、物种等）死光，灭绝，绝迹； （of a custom, practice, etc.）is no longer common （指习俗、知法等）消失，过时 　　Some of the creatures on Earth are dying out. 地球上有些