The teacher decided to give him 10 mark because his test was good 

--> Because 

Giúp mình với 

`-` Because of his good test , the teacher decided to give him 10 mark

`-` CT :

Because + S + V (mệnh đề )

Because + V-ing/N/N phrase

$baoyen.$

Because his test was good, the teacher decided to give him 10 marks.

Because of his good test, the teacher decided to give him 10 marks.

- Because + mệnh đề nguyên nhân, mệnh đề kết quả : bởi vì

- Mệnh đề kết quả + because + mệnh đề nguyên nhân

- Because of + danh từ/ V-ing, kết quả