核心问题
See to it that you're ready on time.
应如何分析 see to it that 结构, 它与 see that 有什么区别?
词典解答
see that 是 see to it that 的省略形式。在这个结构中，it 是形式宾语，它代替的是 that 从句（真实宾语）。see(to it)that 的意思是：“留神，注意”“保证”“务必”“负责”：
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See (to it) that you always carry your passport. 你务必时时带着你的护照。
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I will see (to it) that he writes the letter correctly. 我将注意使他写信不出错儿。
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See to it that you are not late again. 注意不要再迟到。