摘要：1．时间状语的变化 He said, I spoke to them yesterday. → He said that h had spoken to them the day before. 他说他前一天跟他们讲过话了. The student said, We have learned about 3,000 English words so far. → The student said that they had learned about 3,000 English words by then. 那学生说到那时为止他们已学会了3,000个英语单词.

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