一下子 (yīxiàzi) can be used as an adverb, meaning "all at once." Because it inherently encompasses a sense of "completion," it's typically going to be followed by a 了 (le) later in the sentence. Used as "All at Once" 一下子 (yīxiàzi) is a very informal expression to describe how fast things happened. It usually touches upon sudden or severe changes in a very short amount of time. Although 一下子 (yīxiàzi) is already quite informal, in colloquial Chinese 一下 (yīxià) can also be used to express the same thing. Structure: Subj. + 一下子 + Predicate + 了 Examples: 天气一下子变冷了。(tiānqì yīxiàzi biàn lěng le) = The weather suddenly got cold. 他一下子吃了三碗米饭。(tā yīxiàzi chī le sān wǎn mǐfàn) = He ate three bowls of rice all at once. 她下楼的时候一下子摔倒了。(tā xiàlóu de shíhou yīxiàzi shuāidǎo le) = As she went down the stairs, she suddenly fell. 我们说话的时候，她 一下子哭了。(wǒmen shuōhuà de shíhou, tā yīxiàzi kū le) = She burst into tears when we were talking. 她上个月一下子瘦了很多。(tā shàng gè yuè yīxiàzi shòu le hěn duō) = Last month, she lost a lot of weight all at once. Used as "Quickly" and "Naturally" 一下子 (yīxiàzi), followed with 就 (jiù), usually implies that things happened very quickly, naturally, and easily. Again, 一下 (yīxià) can also be used instead of 一下子 (yīxiàzi). Structure: Subj. + 一下子 + 就 + Predicate + 了 Examples: 老师进来以后，大家一下子就安静了。(lǎoshī jìnlái yǐhòu, dàjiā yīxiàzi jiù ānjìng le) = Everyone became silent after the teacher came in. 听他说完，我一下子就明白了。(tīng tā shuō wán, wǒ yīxiàzi jiù míngbai le) = After hearing him out, I understood everything all at once. 他是最高的，我一下子就看到他了。(tā shì zuì gāo de, wǒ yīxiàzi jiù kàndào tā le) = He is the tallest. I spotted him right away. 拍完那部电影，他一下子就出名了。(pāi wán nà bù diànyǐng, tā yīxiàzi jiù chūmíng le) = He became very famous soon after that movie came out. 看到那张照片，我一下子就想起来了。(kàndào nà zhāng zhàopiàn, wǒ yīxiàzi jiù xiǎng qǐlái le) = It all came back to me when I saw that picture. # Our teachers # More than 10 years teaching experience Master Degree Certificate for teaching chinese as a foreign language   # About us # Founded in 2007 Chinese test and training center 200+ Chinese teachers 5000+ students  # Contact us# Name:fiona Phone number:021-52287809,13918358891 E-mail:info@mandarinmorning.com www.mandarinmorning.com If you are interested to join Mandarin Morning school or want more details about our services, scan the following QR code. ☟   Mandarin Morning Chinese test center attached to Confucius institute headquarters Authorized Test Center and Training Center for International Chinese Language Teacher Certificater 10 years+ ，200 teachers ，more 10000 students，200+companies  |
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