北师大版英语必修三第7单元lesson3Grammar.ppt

M3 U7 LESSON 3-2 The Sea World Grammar Objectives By the end of the lesson, you’ll be able to tell the rules of making comparison; use the structures to make comparison. Structure meaning They have a huge mouth and can eat fish as big as themselves. The tiniest fish is not as big as a fly in your house. 和……一样…… 不如…… 同级表达形式：(not) as + 原形 + as What do they have in common? as big as not as big as Practice 他捕了一条和自己一样大的鱼。 He caught a fish as big as himself. The fish he caught is as big as himself. Practice A shark is not as friendly as a dolphin. 鲨鱼可没海豚那么友善。 比较级表达形式：原形+er； more / less +原形 Crabs are smaller creatures in the sea. Penguins are more friendly than seals. Flying fish are less colorful than some other fish. Structure meaning Can you summarize the rule? Practice 企鹅比北极熊滑稽。 Penguins are funnier than polar bears. Practice A shark is not as friendly as a dolphin. A shark is less friendly than a dolphin. less + 形容词比较级+than 表一方不及另一方 鲨鱼没有海豚那么友善。 最高级表达形式：原形+est； most+原形 You can see some of the strangest fish in the world. Virtual voyage is our most up-to-date attraction. Structure meaning What rules do you find? The _____fish in the sea is the shark. The _____ fish in the sea is the flying fish. most unusual most dangerous Practice 7 Practice smaller the most intelligent The biggest the most popular the easiest better the friendliest 1 2 3 4 5 6 7 常见难点句式 1. 倍数与差额 Some fish can produce sounds almost twice as loud as your speaking voice! Their school yard is four times as large as ours. He is a head taller than I am. We arrived there two hours earlier than the other team. 常见难点句式 表示倍数的四个句型： 1.—— times as +原级 +as (once一倍 twice/double两倍 三倍以上用基数词，three/four/five/…… times三/四/五…..倍) This road is 4 times as big as that one. 2.—— times + 比较级 + than 3.—— times the + length/size/weight/height/width/depth + of +…… The road is 4 times the length of that one. 4.用介词by表达相差的程度 She is taller than I by 3 centimetre