Don't forget to use primer first when you paint the house.
刷房子之前别忘了刮底漆。
My brother wants to learn how to play the piano.
我的兄弟要去学弹钢琴。
If an unfair law existed, - and there were many that had been passed by the British rulers in India and South Africa - it was the duty of everyone to disobey this law, but without using violence.