(
课件网) Unit 1 Food for thought 【Grammar 】 Modals … I was able to hold a knife and fork – and chopsticks! c. … Mum and I just have to find a way to get him into the kitchen! e. “You needn’t try it if you don’t want to,” Mum said, … Think and work out the meanings of the words in red. b. But there are still some dishes that Dad dare not try even after many years of marriage to my mother. d. … we’d better not eat too much roast food as it may make us suffer from heat inside our bodies, … a. be able to b. dare not c. have to d. had better e. needn’t 1. be afraid to do something 2. not be necessary to do something 3. give advice to do or not to do something 4. be necessary or give strong advice to do something 5. have the ability to do something Match the meanings to the words. Modals be able to后接动词原形，表示某人做某事的能力，可用于大多数时态。用于过去时态时，还可以表示“某人过去或当时成功地做了某事”。 I will be able to speak Japanese in another few months. 再过几个月，我就能讲日语了。 They were able to escape from the building when the fire broke out. 火灾发生时，他们设法从那栋建筑里逃了出去。 Function of Modals 1 be able to have to 的含义与 must 相似，两者往往可以互换使用，但 have to 有各种时态，且强调客观需要，意为“不得不”。 I have to leave because of the bad weather. 因为天气不好，我不得不离开了。 Function of Modals 2 have to had better后接动词原形，意为“最好”，用于现在时或将来时，可用于一切人称，没有任何词形变化。had better 的否定式是在其后加 not，疑问式是把 had 和 not 提前。 You’d better sit here and have a rest. 你最好坐在这儿休息一下。 She had better not tell lies any more. 她最好再也别撒谎了。 Function of Modals 3 had better If you dare not try a “painful” diet to stay healthy, this new app is the perfect solution — and you needn’t pay for it! The app works by quickly showing photos of different food. All you have to do is select the photos of healthy food. Then you’ll be able to train your brain to select healthy food in real situations. So, if you’re a sugar addict and aren’t able to say no to chocolate or cola, you had better download it now! Underline the modals and talk about their meanings. 2) need 表示“需要”或“必须”，作情态动词时，用于否定句或疑问句 中，在肯定句中一般用 must，have to，ought to 或 should 代替。 dare 作情态动词时，主要用于否定句、疑问句和条件从句中，一般不用在肯定句中。 3) dare 和 need 常用作实义动词，有时态、人称和数的变化。所不同的是， 作实义动词时，在肯定句中，dare 后面通常接带 to 的不定式；在否定 句和疑问句中，dare 后面可接带 to 或不带 to 的不定式。 Function of Modals 4 How dare you say I’m unfair 你怎么敢说我不公平？ I dare not say you are unfair. 我不敢说你不公平。 I dare to swim across this river. 我敢游过河去。 He does not dare (to) answer. 他不敢回答。 You need finish the work on time. 你需要准时完成这份工作。 You needn’t come so early. 你不用这么早来。 You need to finish the work on time. 你需要准时完成工作。 You don ... ...
