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yīn wèi ..., suó yǐ ....
phr. because..., therefore,...
Discussion of ...,.../...,...
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The conjunctions 因为 and 所以 are often used together in a complex sentence to indicate cause and effect. For example:
Example 1. 因为下雨了,所以我没去跑步。 [phr] Because it rained, I did not go jogging.

There are two points we need to bear in mind when we use the conjunctions:
1. It is not necessary that the two appear together in a sentence: 因为 can be used by itself at the beginning of the first clause indicating the cause or reason (Example 2). Likewise, 所以 can also be used alone at the beginning of the second clause indicating the effect or result (Example 3).
Example 2. 因为工作太忙,他已经一年没有休假了。 [phr] He is so busy that he has kept working for a whole year without any holidays.
Example 3. 他喜欢自由自在的生活,所以经常一个人去旅游。 [phr] He likes a life of freedom, so he often travels alone.

2. If we reverse the sequence of the two clauses in the sentence, there are two ways of using the conjunctions. We can either use only 因为 in the second clause indicating the cause (Example 4), or use this structure “(之)所以…,是因为….。”(Example 5).
Example 4. 我喜欢夏天,因为我可以在大海里游泳。 [phr] I like summer because I can swim in the sea. (Or: 我之所以喜欢夏天,是因为我可以在大海里游泳。)
Example 5. 他(之)所以取得这么好的成绩,是因为他平时一直都很努力。 [phr] The reason why he achieved such good grades is that he has always worked hard. (Or: 他取得了这么好的成绩,因为他平时一直都很努力。)
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