摘要: 情态动词have to 的用法.意思是"必须.不得不".它侧重于客观上的必要和外界的权威. (1)结构:主语+have to+动词原形+其他 (一般现在时.主语是第三人称单数时.用has to,句子是过去时.用had to.)如: We have to wear sneakers for gym class. 在体育课上.我们必须穿运动鞋. Tom has to practice the guitar every day. 汤姆每天必须练习弹吉它. I had to get up at 5:00 am last Monday. 上周一.我不得不早上5点起床. (2)否定形式:主语+don't have to+动词原形+其他 (一般现在时.主语是第三人称单数时.用doesn't have to. 句子是过去时.用didn't have to) 如:Nick doesn't have to wear a uniform. 尼克不必穿制服. We didn't have to do our homework at once. 我们不必马上完成作业. (3)疑问句:Do +主语+have to +动词原形+其他 如:Do you have to stay at home on weekends? 周末你必须呆在家里吗?Yes, I do. / No, I don't. 是的.我必须.不.我不必.Did he have to go to bed by 11:00 last night? 昨晚.他不得不11点前上床睡觉吗? 2. 情态动词can的用法 (1)表示能力."会""能"(在第一册中已经学习这种用法) Can you play the guitar? 你会弹吉它吗?Judy can speak a little Chinese. 朱蒂会说一点中文.I can dance and sing. 我能唱歌又能跳舞. (2)表示允许.许可."可以"."能" Can the students run in the hallways? 学生们可以在走廊上跑吗?We can eat outside. 我们可以在外面吃东西.Can I come in? 我能进来吗? 注意 同样是情态动词.can 和have to 的用法是有区别的.和大部分情态动词一样.can在否定句中.直接在can后加上not.在疑问句中.把can放到主语前面.并且没有人称和数的变化.

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