How do you say "is the offer still valid?" in Chinese?
Someone offered to help me with Chinese a year ago. I'd like to say that I'd like to take her up on that offer.

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您之前(one year ago)提到的邀请(offer)还有效(valid)吗？
but it is strange to Chinese.

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in your case, offer means 提议，she offer to help you learning Chinese.   你之前的previous /before 提议（the offer）还有sitll 效 valid 吗？

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Thank you!
Exactly what I needed!

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Usually, we don't say "is the offer still valid?"(这个提供帮助的承诺还有效吗？), we prefer to say "Shall I still ask for your help?"(我还能请您帮助我吗？)