题目内容：

I hate it when they talk with their mouths full of food
it可以省略么?什么时候不能省略?比如 Do you know it where she was born?正确么?

优质解答

你的句子是宾语从句.it是形式宾语,不能省略.真正宾语是when they talk with their mouths full of food.
注意下面的句子不能有it
Do you mind (it在这里不能存在）if / when I go with you?---------因为这是条件/ 时间状语从句.
现在你明白了吗?

追问：

那Do you know it where she was born？为什么不对 这总是宾语从句吧

追答：

Do you know it where she was born？--------是错句，多了一个it.这是宾语从句， where she was born是know的宾语，而it是多余的，并且不能充当形式宾语。 明白了吗？