There is an example of sentence below.

What is it that you don't like about the subway?

And I'll give another sentence below.

I don't like it when the subway gets really crowded.

In second example, what is the meaning of 'when' and 'it'?

  • 1
    The first thing you should learn by heart is to capitalize the first letter of the first word in a sentence.
    – AIQ
    Nov 7 '19 at 4:22

"It" can stand for a definite, obvious referent.

I see the ball. It’s over there. Go get it and throw it back to me.

"It" is impersonal at times.

It is raining.

Other times "it" stands for a condition rather than either of the two preceding cases.

I hate it when I slam the door on my thumb.

This is what your sentences are referring to.

You have "it" standing in for a condition or for specific circumstances.

"When" is only a way of connecting the condition to the feeling.

  • By the way, what about first example? Do you think that the example is correct in the aspect of grammar? I think that 'it' is object, and 'that' is conjunction. Then, Can we say that 'it' is demonstrative pronoun of explaining 'that clause'?
    – bak1936
    Nov 7 '19 at 8:46
  • The first example is correct, natural English. Nov 28 '19 at 3:55

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