You should not go out in the heat of the day.
你不應該在天最熱的時候外出。
I think you should go back to your original plan.
我認為你應該回頭執行你原來的計劃。
The new trade agreement should facilitate more rapid economic growth.
新貿易協定應當會加快經濟發展。
The police force should be independent of direct government control.
警方應該不受政府的直接控制。
In case you should need any help, here's my number.
萬一你需要幫助的話，這是我的電話號碼。