Expressing "don't need to" with "buyong"

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在汉语里，"要"有很多意思，当它表示"need to"的时候，否定形式"don't need to"对应的是"不用"，而不是"不要"。

Structure

Subj. + 不用 + [Verb Phrase]

不用担心。Bùyòng dānxīn.Yon don't need to worry.
不用你帮忙。Bùyòng nǐ bāngmáng.I don't need your help.
今天不用加班。Jīntiān bùyòng jiābān.We don't need to work overtime today.
这件事不用跟他说。Zhè jiàn shì bùyòng gēn tā shuō.You don't need to tell him about this.
告诉他明天不用来了。Gàosu tā míngtiān bùyòng lái le.Tell him that we don't need him to come tomorrow.
大家不用给我买礼物。Dàjiā bùyòng gěi wǒ mǎi lǐwù.Guys, you don't need to buy me presents.
今天人少，不用排队。Jīntiān rén shǎo, bùyòng páiduì.There're only a few people today. We don't need to wait in a queue.
五岁的孩子不用买票。 Wǔ suì de háizi bùyòng mǎi piào.A five-year-old kid doesn't need to buy a ticket.
新员工不用参加这个会议。Xīn yuángōng bùyòng cānjiā zhège huìyì.New staff don't need to attend this meeting.
我们只去两天，你不用带这么多衣服。Wǒmen zhǐ qù liǎng tiān, nǐ bùyòng dài zhème duō yīfu.We'll only stay there for two days. You don't need to take so many clothes.

在口语里，反问句"这还用说（吗）？"表示说话人认为事情很明显，对方问得多余，常常含有不屑回答或者不耐烦的语气。