1. My best friend studied very hard, so he passed the exam easily. Because 2. It rained heavily, bút we went to the cinema last weekend. Even though

1. My best friend studied very hard, so he passed the exam easily.

 => Because my best friend studied very hard, he passed the exam easily.

* Because +S1 + V1, S2 + V2

"Because : bởi vì . Dùng để nối hai mệnh đề 

--> So ở mệnh đề này thì because ở mệnh đề kia 

2. It rained heavily, but we went to the cinema last weekend.

=>  Even though it rained heavily, we went to the cinema last weekend

* Eventhough + S1 + V1, S2 + V2

"Even though" = because 

--> eventhough ở mđ này thì but ở mệnh đề kia