You should not go out in the heat of the day.
你不应该在天最热的时候外出。
I think you should go back to your original plan.
我认为你应该回头执行你原来的.计划。
The new trade agreement should facilitate more rapid economic growth.
新贸易协定应当会加快经济发展。
The police force should be independent of direct government control.
警方应该不受政府的直接控制。
In case you should need any help, here's my number.
万一你需要帮助的话，这是我的电话号码。