see to it that/see that

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”：

1. See (to it) that you always carry your passport. 你务必时时带着你的护照。

2. I will see (to it) that he writes the letter correctly. 我将注意使他写信不出错儿。

3. See to it that you are not late again. 注意不要再迟到。