Cause and effect: “因为……，所以……”
The pattern “因为……，所以……” (yīnwèi..., suǒyǐ...) expresses a cause-and-effect relationship.
因为states the cause
所以states the result
因为 and 所以 may be used together, or just one of them.
Basic structure
因为 + cause，所以 + result
Meaning: because …, therefore …
Examples
就是因为没穿过，所以要试试啊！
Precisely because you've never worn it, that's why you should try it on!
因为 + 没穿过
所以 + 要试试
就是因为precisely because
没穿过have never worn
所以so
要试试should try it on
Here 因为 introduces the cause and 所以 the result.
因为我生病了，今天没去上班。
Because I fell ill, I didn't go to work today.
因为 + 我生病了
今天没去上班
因为because
我生病了I fell ill
今天today
没去上班didn't go to work
Only 因为 is used here; 所以 is dropped.
我没去过他家，所以让他来车站接我。
I've never been to his place, so I asked him to meet me at the station.
我没去过他家
所以 + 让他来车站接我
我没去过他家I've never been to his place
所以so
让他ask him to
来车站接我come to the station to meet me
Only 所以 is used here; 因为 is dropped.
Quick rule
Both together:
因为 + cause，所以 + result
Because …, therefore …
因为 alone:
因为 + cause，+ result
Because …, …
所以 alone:
Cause，所以 + result
…, so …
因为我生病了，今天没去上班。— Because I fell ill, I didn't go to work today.
我没去过他家，所以让他来车站接我。— I've never been to his place, so I asked him to meet me at the station.