这就是为什么 (zhè jiù shì wèishénme)
The common expressions
这就是为什么 (zhè jiù shì wèishénme)
This phrase literally means “This is why” and is used to explain a reason.
e.g.
我昨天没睡好，这就是为什么我今天很累。 (Wǒ zuótiān méi shuì hǎo, zhè jiù shì wèishénme wǒ jīntiān hěn lèi.) I didn’t sleep well last night, that’s why I am very tired today.
他努力工作，这就是为什么他成功了。 (Tā nǔlì gōngzuò, zhè jiù shì wèishénme tā chénggōng le.) He works hard, that’s why he succeeded.
我们错过了火车，这就是为什么我们迟到了。 (Wǒmen cuòguò le huǒchē, zhè jiù shì wèishénme wǒmen chídào le.) We missed the train, that’s why we were late.
The extended phrases to express “That’s why” in Chinese
所以 (suǒyǐ)
This is a common and straightforward way to say “That’s why” or “Therefore” in Chinese.
e.g.
天气很冷，所以我们在家里待着。 (Tiānqì hěn lěng, suǒyǐ wǒmen zài jiālǐ dāizhe.) The weather is very cold, that’s why we are staying at home.
他生病了，所以没来上班。 (Tā shēngbìng le, suǒyǐ méi lái shàngbān.) He is sick, that’s why he didn’t come to work.
我忘了带钥匙，所以进不去家门。 (Wǒ wàngle dài yàoshi, suǒyǐ jìn bù qù jiāmén.) I forgot to bring my keys, that’s why I can’t get into the house.
因此 (yīncǐ)
This phrase means “therefore” or “that’s why” and is often used in formal or written Chinese.
e.g.
他在外地工作，因此我们很少见面。 (Tā zài wàidì gōngzuò, yīncǐ wǒmen hěn shǎo jiànmiàn.) He works in another city, that’s why we rarely see each other.
天气不好，因此活动取消了。 (Tiānqì bù hǎo, yīncǐ huódòng qǔxiāo le.) The weather is bad, that’s why the event was canceled.
他没做作业，因此被老师批评了。 (Tā méi zuò zuòyè, yīncǐ bèi lǎoshī pīpíng le.) He didn’t do his homework, that’s why he was criticized by the teacher.
于是 (yúshì)
This phrase means “so” or “that’s why” and is used to show a direct result or consequence.
e.g.
他感冒了，于是去看医生。 (Tā gǎnmào le, yúshì qù kàn yīshēng.) He caught a cold, that’s why he went to see a doctor.
我忘记了时间，于是错过了会议。 (Wǒ wàngjì le shíjiān, yúshì cuòguò le huìyì.) I lost track of time, that’s why I missed the meeting.
她饿了，于是去吃东西。 (Tā è le, yúshì qù chī dōngxi.) She was hungry, that’s why she went to eat.
所以说 (suǒyǐ shuō)
This phrase means “that’s why” or “so” and is often used in spoken Chinese to conclude an explanation.
e.g.
他不喜欢吃辣的，所以说我没有加辣椒。 (Tā bù xǐhuān chī là de, suǒyǐ shuō wǒ méiyǒu jiā làjiāo.) He doesn’t like spicy food, that’s why I didn’t add any chili peppers.
天气很热，所以说我们应该多喝水。 (Tiānqì hěn rè, suǒyǐ shuō wǒmen yīnggāi duō hē shuǐ.) The weather is very hot, that’s why we should drink more water.
他今天不舒服，所以说请假了。 (Tā jīntiān bù shūfu, suǒyǐ shuō qǐngjià le.) He isn’t feeling well today, that’s why he took a day off.
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