助动词和情态动词改错问题1
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助动词和情态动词改错问题1
They 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”,说could use的话是说“原可用”,请问有啥米区别吗?
They 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”,说could use的话是说“原可用”,请问有啥米区别吗?
这个是虚拟语气,should have used是有种遗憾的语气,说他们本来可以用的.could use 是能否的语气,是说他们可以用或者不可以用,但题目中当时没有谁限制他们能否用