在公共场所不准吸烟 翻译

公共场所不允许吸烟的英文翻译为什么是过去式？

不是过去式啊，一般是No Smoking

So the public places should forbid smoking.

Don't smoke in public.
No smoking in public.

in public 也可以转换成 in public places.

Smoking is not allowed in the public.
或者Smoking is forbidden in the public.

Don't smoking in public.
in public是固定搭配

no smoking in public places

it isn't allowed to smoke in public.
不被允许用被动语态

No smoking in public area.