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请问下面一句英语中虚拟语气部分的否定形式为什么不是don't become?

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请问下面一句英语中虚拟语气部分的否定形式为什么不是don't become?
Mr.Romney said it is important that Pakistan not become a failed state.
请问下面一句英语中虚拟语气部分的否定形式为什么不是don't become?
你首先应该知道:
1 it is important + that + sb should (not) do sth是一个“习惯用法”.-------这是主语从句.
2 在这种习惯用法中,should可以省略,所以你的句子是 it is important that Pakistan (should) NOT become a failed state.