有人 + Verb Phrase
The pronoun 有人 (yǒurén) means 'someone' or 'there is someone.' It is used to refer to an unspecified person and often introduces a wish, hope, or statement about an unknown individual. It functions similarly to 'somebody' in English.
有人在外面敲门,你去看看是谁。
Yǒu rén zài wàimiàn qiāo mén, nǐ qù kànkan shì shéi.
Someone is knocking at the door outside; go see who it is.
有人说学中文很难,但我觉得很有趣。
Yǒu rén shuō xué Zhōngwén hěn nán, dàn wǒ juéde hěn yǒuqù.
Some people say learning Chinese is very hard, but I think it's very interesting.
终于有人愿意帮我搬家了。
Zhōngyú yǒu rén yuànyì bāng wǒ bānjiā le.
Finally someone is willing to help me move.