noticed

[navi]

Are these sentences correct with the given meanings:

1-I noticed it when you winked at her. (Meaning: I noticed that you winked at her, when you winked at her.)

2-I realized it when you made that mistake. (Meaning: I realized that you made that mistake, when you made that mistake.)

[Pete]

Are these sentences correct with the given meanings:

1-I noticed it when you winked at her. (Meaning: I noticed that you winked at her, when you winked at her.)

2-I realized it when you made that mistake. (Meaning: I realized that you made that mistake, when you made that mistake.)
I think these are both correct. Sentence #1 seems completely natural.

I'm not sure why, but though I think it is correct, #2 doesn't strike me as the most common way to say this; I'd be more likely to omit "it" in that sentence.

[navi]

Thanks Pete,
So sentence 1 can be used even if "it" has not been defined beforehand; the "when you winked at her" would show that "it" replaces "your winking at her" even if we haven't mentioned the wink up to the time I say that sentence. Am I correct?

[Pete]

Thanks Pete,
So sentence 1 can be used even if "it" has not been defined beforehand; the "when you winked at her" would show that "it" replaces "your winking at her" even if we haven't mentioned the wink up to the time I say that sentence. Am I correct?
Yes, you are correct.

Another way to think of the sentence is to interpret the word "it" as
- I noticed the event/the action/the happening when you winked at her.
or
- I noticed what was done when you winked at her.

The original sentence with "it" is far the more natural way to express this.