Causal Complex Sentences
因果复句
Express cause and effect using causal sentence patterns with and without connectors
Causal sentences explain WHY something happened. Without connectors, the cause clause comes first, followed by the result. With connectors, 因为……所以…… is the standard "because… therefore…" pattern.
Unlike English, Chinese commonly uses BOTH "because" and "therefore" together (因为……所以……). You can also use just one: 因为…… or 所以…… alone, but the pair together is most standard.
Lesson Targets
Podcast
Podcast: Causal Complex Sentences (因果复句)
Listen to Jason & Amy explain the 因果复句 pattern
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Understanding 因果复句
Every event has a reason, and causal sentences let you explain it. Without connectors, you simply state the cause first and the effect second: 我今天太忙了，午饭都没吃 (I was too busy today — I did not even eat lunch). The listener understands the causal link from context. For explicit cause-and-effect, use 因为……所以……: 因为很累，所以我今天不想做饭了 (Because I am very tired, I do not want to cook today). What makes Chinese special is that you use BOTH words together — in English you would say "Because I am tired, I do not want to cook" OR "I am tired, so I do not want to cook" — but Chinese happily uses both 因为 and 所以 in the same sentence. This feels redundant in English but is perfectly natural in Chinese. Master this pattern and you can explain anything.
Key Points
- Without connectors: cause comes first, result follows. Context shows the relationship.
- 因为 (yīnwèi) = "because" — introduces the cause/reason.
- 所以 (suǒyǐ) = "therefore / so" — introduces the result/consequence.
- Using BOTH 因为 and 所以 together is standard and natural in Chinese.
- You can use 因为 alone (dropping 所以) or 所以 alone (dropping 因为).
- 因为 always introduces the CAUSE clause, which comes FIRST.
- 都 in the result clause emphasizes an extreme effect: 忙得午饭都没吃 (so busy I did not even eat).
- When answering 为什么 questions, start with 因为.
Chinese speakers value explaining reasons clearly. Giving a 因为 before a 所以 shows logical thinking and respect for the listener. In social situations, providing reasons (even brief ones) is considered more polite than abrupt statements.
Key Vocabulary
Example Sentences
我今天太忙了，午饭都没吃。
I was too busy today — I did not even eat lunch.
No connector — implied cause-effect
那个学生病了，没来上课。
That student was sick and did not come to class.
No connector — reason then result
因为很累，所以我今天不想做饭了。
Because I am very tired, I do not want to cook today.
因为明天有考试，所以我想早一点儿睡觉。
Because there is an exam tomorrow, I want to go to bed a bit earlier.
因为下雨了，所以我们没去公园。
Because it rained, we did not go to the park.
他因为生病了，所以请假了。
He asked for leave because he was sick.
因为 after subject is also correct
路上车太多了，所以我迟到了。
There were too many cars on the road, so I was late.
所以 alone, cause implied
因为他帮了我很多，我非常感谢他。
Because he helped me a lot, I am very grateful to him.
因为 alone, 所以 omitted
Common Mistakes
因为 (cause) always comes FIRST, 所以 (result) always comes SECOND.
因为 appears only once (cause clause). The result clause uses 所以, not another 因为.
Practice Exercises
Tips & Tricks
In Chinese, using 因为 AND 所以 together is natural — do not feel it is redundant.
When answering 为什么 questions, start with 因为: "为什么迟到了？" "因为路上堵车了。"
You can drop either 因为 or 所以, but keeping both is the safest and most standard.
Practice explaining daily events: 因为……所以…… helps you think logically in Chinese.
Homework
Write eight causal sentences about things that happened this week. Use 因为……所以…… for four, use only 所以 for two, and write two without any connectors. Focus on real events from your life.