should better not後面加什麼

例句：

When should you prune apple trees?

蘋果樹應該什麼時候剪枝？

Should police officers carry guns ?

警察應該佩槍嗎？

No income should remain undeclared.

一切收入均應申報。

The selectors should resign en bloc.

這些選擇者應該集體辭職。

You should have seen it!

你應該看見的！