Würde "in those moments" sagen.

Zweimal "moments" ist stilistisch okay.

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That is the teacher who my sister likes a lot.

That is the teacher my sister likes a lot. (Auslassung).

Beide okay. Beide kommatalos.

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Würde das so sagen, auf AE:

A friend asked me if we could talk during my vacation (school break), and of course I said yes since I am not going to be in school.

"since I won't be in school" ist auch okay.

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