是一般现在时。

Maybe you should socialize more.

也许你应该多和人交往。You should tell the truth to the public.

你应该将真相公之于众。I can't believe you should do such an unscrupulous thing.

我不敢相信你竟然做出这样不择手段的事。

If I were you， I should stay in the home.

如果我是你，我就呆在家里。