(
课件网) Unit 3 Can I help you? Lesson 17 精通版·五年级下册 New words 等待 拿；乘坐 年轻的 孩子（复数） 人；人们 Just talk Look out! You mustn’t cross the street now. You must wait for the green light. You mustn’t spit on the ground. You mustn’t litter. You mustn’t pick the flowers. You must keep off the grass. You must take good care of young children. Language points 1. Look out!当心！ look out意为“当心，小心”，用于提醒别人注意某事物。其用法相当于 “Be careful!”。 例句: 当心！你现在不能过马路。 Look out! You mustn’t cross the street now. 2.You must wait for the green light.你必须等待绿灯。 must是情态动词，意为“必须”，语气强烈，后面跟动词原形，没有人称和数的变化，其句型结构为：主语+mustn’t+动词原形+其他. 在must后面加not变成否定式，缩略形式为mustn’t。 Just Practise help old people keep off the grass take good care of young children 帮助老人 不要进入草地 照看好儿童 play on the street pick flowers litter 在街道上玩耍 摘花 乱丢杂物 You must wait for the green light. You mustn’t cross the street when the light is red. You must help old people. You mustn’t pick flowers. Let’s make and talk Talk about your sign. We must wait. Don’t cross the street. What must we do? Keep off the grass. Let’s chant ir The first girl wears a new shirt. The second girl wears a new skirt. Today is the first girl’s birthday. She is as happy as a little bird. 字母组合ir在单词中的发音规则 字母组合ir发音/??/的音。/??/是长元音,是字母组合er, ir, or和ur在单词中的发音。发音时舌中部比发/?/音时略高，双唇扁平。
