it 作形式宾语的使用方法(涉及hate it when等)

老师好：请教一下。

张道真英语语法书上在介绍动词后的宾语从句时指出，hate,like,take,owe 等词和 see to 后有宾语补足语时，需要用 it 作形式宾语，然后给出的例子是:

I hate it when they talk with their mouth full of food.

Please see to it that the door is safely locked before you go.

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