You should acquaint yourself with the new regulations.
新しい規則を知っておくべきだ
You should be straight with him.
彼に隠し事をすべきではない
You should bring an umbrella with you.
傘を持っていきなさい
You should do it immediately.
それをすぐになさってください(◆had betterより弱く丁寧)
You should feel mean for being so stingy.
そんなにけちけちして恥ずかしくないか
You should find somewhere to live.
どこか住む場所を見つけた方がいい
You should get your room straight.
部屋を整頓しないと
You should never try to conceal the real you.
ほんとうのあなたを隠そうとしてはいけません
You should next take into account the color scheme.
次には配色を考慮しなくてはならない
You should report on your progress in two weeks.
2週間の進捗しんちょくを報告しなさい