摘要:当不定式短语.动名词短语及主语从句等充当前面陈述部分的主语时.反意问句中的主语用it.例如: What you need is more practice, isn't it? 你需要的是多练习.不是吗? To learn English well isn't easy, isn't it? 学习英语是不容易.不是吗? Swimming is great fun, isn't it? 游泳很有趣.不是吗?

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