助动词和情态动词改错问题1They should (use) coal,but they had to use oil instead,because there remained little coal.括号里的是错的.为什么说should have used,而不说could use呢?说should have used的话是说“应该用了”,
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![助动词和情态动词改错问题1They should (use) coal,but they had to use oil instead,because there remained little coal.括号里的是错的.为什么说should have used,而不说could use呢?说should have used的话是说“应该用了”,](/uploads/image/z/8976266-26-6.jpg?t=%E5%8A%A9%E5%8A%A8%E8%AF%8D%E5%92%8C%E6%83%85%E6%80%81%E5%8A%A8%E8%AF%8D%E6%94%B9%E9%94%99%E9%97%AE%E9%A2%981They+should+%28use%29+coal%2Cbut+they+had+to+use+oil+instead%2Cbecause+there+remained+little+coal.%E6%8B%AC%E5%8F%B7%E9%87%8C%E7%9A%84%E6%98%AF%E9%94%99%E7%9A%84.%E4%B8%BA%E4%BB%80%E4%B9%88%E8%AF%B4should+have+used%2C%E8%80%8C%E4%B8%8D%E8%AF%B4could+use%E5%91%A2%3F%E8%AF%B4should+have+used%E7%9A%84%E8%AF%9D%E6%98%AF%E8%AF%B4%E2%80%9C%E5%BA%94%E8%AF%A5%E7%94%A8%E4%BA%86%E2%80%9D%2C)
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