To help someone do something in English, you can say "to assist someone with something" or "to lend a hand with something".

These phrases come from the verb "assist", which means to help or provide support to someone, and the idiom "to lend a hand", which means to offer help or support.

For example, you can say "Can I assist you with carrying those boxes?" or "I'm happy to lend a hand with the cleaning".

In Chinese, "帮助某人做某事" can be translated as "帮助某人完成某事" or "提供帮助给某人完成某事".

例句:

Can I assist you with carrying those boxes? (我能帮你搬那些箱子吗？)

I'm happy to lend a hand with the cleaning. (我很乐意帮忙清理一下。)