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【答案】1. We use water to clean things every day.
2. We should not waste water.
3. There isn't much coal and oil on Earth.
4. We shouldn't cut down too many trees.
5. We should use paper bags and glass bottles.
【解析】
1. 我们"we", 用某物做某事是短语"use sth to do sth", 句子主语是we, use用原形,水"water", 清洗东西是短语"clean things",每天"every day"。故答案为: We use water to clean things every day.
2. 我们"we", 不应该"should not", 浪费水是短语"waste water",跟在情态动词后面waste用动词原形。 故答案为: We should not waste water.
3. 根据句意这是否定句, 这是There be句型, 煤和石油是"coal and oil",be和后面的名词保持一致,用is, 否定句用isn't. 修饰不可数名词"多的"用"much", 地球上是短语"on Earth", 故答案为: There isn't much coal and oil on Earth.
4. 我们"we", 不应该"shouldn't", 树"tree", 这里是类指用复数,修饰可数名词复数,太多用"too many", 砍到"cut down", 句子中有情态动词,cut用原形。故答案为: We shouldn't cut down too many trees.
5. 我们"we", 应该"should", 使用"use", 跟在情态动词后用原形,纸袋"paper bag", 玻璃瓶"glass bottle", 这里是类指,bag和bottle用复数。故答案为: We should use paper bags and glass bottles.