B2
will → would · can → could · may → might · must → had to
情态动词的间接引语
讲解
退时态时，情态动词按上表变化。would、could、might、should 和 ought to 不再变化，因为它们本身已经是过去式形式。must 表示推测时保持不变，表示必须时才变成 had to。 常见错误：表示必须的 must 要变：He said we must wait ✗（过去时的转述中），He said we had to wait ✓。
例句
He said he would help.
他说他会帮忙。
She said she could not come.
她说她来不了。
They said we had to wait.
他们说我们得等一等。
He said it might rain.
他说可能会下雨。
练习
通过选择题测试你的掌握程度
高效学习“will → would · can → could · may → might · must → had to”
语法点“will → would · can → could · may → might · must → had to”（情态动词的间接引语）是 CEFR 4 级别的重要结构之一。要熟练运用这个结构，你需要弄清楚它的使用语境，并经常练习。
学习小贴士：把例句大声朗读多遍，培养自然的语感反应。然后试着结合自己的生活情境造句。用发音按钮听标准发音并跟着练习。
你也可以查看完整课程“”，更深入地了解相关的语法和词汇。