How common it is
因为 appears often in everyday Chinese, so it is worth practicing early and reviewing often.
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Pronunciation focus
Say yīnwèi slowly first, then repeat it in a short phrase. Listen for the tone shape.
Usage note
因为是用来解释原因的词语，通常放在句子前面。
yīn wèi shì yòng lái jiě shì yuányīn de cíyǔ, tōngshù zài jùzi qiánmiàn.
Because is a word used to explain reasons. It usually comes at the beginning of a sentence.
Context note
因为常用于解释事情的原因。比如，你可以用它来说明为什么你没有完成作业。
yīn wèi cháng yòng yú jiě shì shìqíng de yuányīn. bǐrú, nǐ kěyǐ yòng tā lái shōumíng wèishéme nǐ méiyǒu wánchéng zuòwén.
Because is often used to explain the reasons for things. For example, you can use it to explain why you didn't finish your homework.
5 examples
因为下雨了，我们取消了野餐。
yīn wèi xià yǔ le， wǒ men qǔ xiāo le yě cān。
Because of the rain, we canceled our picnic.
因为我生病了，所以我请假了。
yīn wèi wǒ shēng bìng le， suǒ yǐ wǒ qǐng jià le。
Because I was sick, I took a leave.
因为天气太冷，他没去游泳。
yīn wèi tiān qì tài lěng， tā méi qù yóu yǒng。
Because the weather was too cold, he didn't go swimming.
因为作业太多，我熬夜了。
yīn wèi zuò yè tài duō， wǒ áo yè le。
Because I had too much homework, I stayed up late.
因为妈妈不在家，他自己做饭。
yīn wèi mā ma bú zài jiā， tā zì jǐ zuò fàn。
Because his mom wasn't home, he cooked by himself.
5 mini stories
今天天气不好，所以我们没有去公园玩。因为下雨了，我们取消了野餐。
jīn tiān tiān qì bù hǎo， suǒ yǐ wǒ men méi yǒu qù gōng yuán wán。 yīn wèi xià yǔ le， wǒ men qǔ xiāo le yě cān。
The weather was bad today, so we didn't go to the park. Because it rained, we canceled our picnic.
我昨天没完成作业，因为我生病了。所以今天我要补做。因为作业太多，我熬夜了。
wǒ zuó tiān méi wán chéng zuò yè， yīn wèi wǒ shēng bìng le。 suǒ yǐ jīn tiān wǒ yào bǔ zuò。 yīn wèi zuò yè tài duō， wǒ áo yè le。
I didn't finish my homework yesterday because I was sick. So today I have to do it again. Because I had too much homework, I stayed up late.
妈妈不在家，所以他自己做饭。因为厨房里没有他喜欢的菜，所以饭做得不好吃。
mā ma bú zài jiā， suǒ yǐ tā zì jǐ zuò fàn。 yīn wèi chú fáng lǐ méi yǒu tā xǐ huan de cài， suǒ yǐ fàn zuò dé bù hǎo chī。
His mom wasn't home, so he cooked by himself. Because there was no food he liked in the kitchen, the meal didn't taste good.
今天天气太冷，所以他没去游泳。因为水很凉，他不想下水。
jīn tiān tiān qì tài lěng， suǒ yǐ tā méi qù yóu yǒng。 yīn wèi shuǐ hěn liáng， tā bù xiǎng xià shuǐ。
The weather was too cold today, so he didn't go swimming. Because the water was very cold, he didn't want to get in.
我昨天没有完成作业，因为我生病了。所以今天我要补做。因为作业太多，我熬夜了。
wǒ zuó tiān méi yǒu wán chéng zuò yè， yīn wèi wǒ shēng bìng le。 suǒ yǐ jīn tiān wǒ yào bǔ zuò。 yīn wèi zuò yè tài duō， wǒ áo yè le。
I didn't finish my homework yesterday because I was sick. So today I have to do it again. Because I had too much homework, I stayed up late.