Is "good at" used a lot? Please teach me some example sentences.
Yes. The phrase "good at" is used quite frequently in English. You can either say that someone is good at something or not good at something. If you are good at something, it means you do that activity or task well. If you are not good at something, it means that you struggle with that activity or task. In this movie, Bradley Cooper's character tells Lady Gaga that he can't keep secrets (I'm not good at keeping secrets). Here are a few example sentences. Ex: Wow! You are really good at sewing. Ex: I'm not very good at math. Ex: Lady Gaga is good at singing. Ex: He is not good at telling the truth.
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