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INTERMEDIATE LEVEL
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since that, because of that ☊ 
kể từ đó ☊
→ → →
like: kể từ đó → →
I was bitten by a dog once and I've been afraid of them ever since. ☊ ever since (...) ☊
He left home two weeks ago and we haven't heard from him since. ☊ since ☊
I saw them at Christmas but haven't heard a thing since then. ☊ then ☊