Cause and effect: “因为……，所以……”
The pattern “因为……，所以……” (yīnwèi..., suǒyǐ...) expresses a cause-and-effect relationship.
因为yīnwèistates the cause
所以suǒyǐstates the result
因为 and 所以 may be used together, or just one of them.
Basic structure
因为 + cause，所以 + result
Because …, therefore …
Examples
就是因为没穿过，所以要试试啊！
就是因为jiù shì yīnwèiprecisely because
没穿过méi chuān guohave never worn
所以suǒyǐso
要试试yào shìshishould 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
因为yīnwèibecause
我生病了wǒ shēngbìng leI fell ill
今天jīntiāntoday
没去上班méi qù shàngbāndidn'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
我没去过他家wǒ méi qù guo tā jiāI've never been to his place
所以suǒyǐso
让他ràng tāask him to
来车站接我lái chēzhàn jiē wǒcome 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.