The structure 因为…所以…
“Since..., so…”
To construct this type of sentence, we can use either the full structure or parts of it separately.
When to use the full structure 因为…所以…
The structure 因为…所以… 
is used as a complex sentence and indicates the cause and effect.
The cause should be always stated first, and we put it right after 因为. The result is stated in the second part of the sentence, and we put it after 所以.
is used as a complex sentence and indicates the cause and effect.
The cause should be always stated first, and we put it right after 因为. The result is stated in the second part of the sentence, and we put it after 所以.
Examples
因为汉语工作中很重要，所以要努力学习这个语言
Since Chinese is very much in demand at the workplace, we must study it hard
yīnwèi hànyǔ gōngzuò zhōng hěn zhòngyào, suǒyǐ yào nǔlì xuéxí zhège yǔyán
If there is only one subject in a sentence, we can state it either before or after 因为.
If the sentence has two subjects, the first is stated after 因为 and the second is stated after 所以.
Scheme
因为
(subject 1)
predicate 1
cause
所以
(subject 2)
predicate 2
effect
Examples
因为我白天工作，所以只能上夜校
Since I work during the day, I can only go to night school
yīnwèi wǒ báitiān gōngzuò, suǒyǐ zhǐ néng shàng yèxiào
因为他不理我，所以我决定不跟他说话了
Since he is ignoring me, I decided not to talk to him
yīnwèi tā bù lǐ wǒ, suǒyǐ wǒ juédìng bù gēn tā shuōhuà le
How to use 因为 and 所以 separately
We also can use 因为 and 所以 on their own.
Remember that 所以 can only be stated in the second part of a complex sentence.
Examples
我们不喜欢这地方，所以决定搬走
We didn't like the place, so we decided to move out
wǒmen bù xǐhuan zhè dìfāng, suǒyǐ juédìng bān zǒu
Remember that 因为 can be stated either in the first or the second part of a sentence.
Examples
晚会很成功，因为每个人都很投入
The party was successful because everyone was very involved
wǎnhuì hěn chénggōng, yīnwèi měi ge rén dōu hěn tóurù
因为下雨，他们中止了比赛
They cancelled the game because of the rain
yīnwèi xià yǔ, tāmen zhōngzhǐ le bǐsài