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【答案】1. He shouldn't smoke in the restaurant.
2. They shouldn't put rubbish on the ground.
3. They shouldn't talk in the library.
4. They shouldn't put rubbish in the water.
5. They shouldn't cut down the trees.
【解析】
1. 图片是在饭店抽烟, 用shouldn't组成句子: 他不应该在饭店抽烟。他"he", 在饭店是短语"in the restaurant", 吸烟"smoke", 用在情态动词should后面,smoke用动词原形。 故答案为: He shouldn't smoke in the restaurant.
2. 图片是向地上乱扔垃圾, 用shouldn't组成句子: 他们不应该在地上乱扔垃圾。他们"they", 将......放在地上是短语"put ... on the ground",, 用在情态动词should后面,put用动词原形。 垃圾是"rubbish". 故答案为: They shouldn't put rubbish on the ground.
3. 图片是在图书馆说话, 用shouldn't组成句子: 他们不应该在图书馆说话。他们"they", 在图书馆是短语" in the library",说话"talk", 用在情态动词should后面,talk用动词原形。 故答案为: They shouldn't talk in the library.
4. 图片是往水里扔垃圾, 用shouldn't组成句子: 他们不应该向水里扔垃圾。他们"they", 向水里扔垃圾是短语" put rubbish in the water",用在情态动词should后面,put用动词原形。 故答案为: They shouldn't put rubbish in the water.
5. 图片是砍树, 用shouldn't组成句子: 他们不应该砍树。他们"they", 砍树是短语"cut down the trees",用在情态动词should后面,cut用动词原形。 故答案为: They shouldn't cut down the trees.