1. 情態動詞：could, should, would, might, may,will, can
2. 程度副詞：
肯定：
certainly
surely
naturally
obviously
understandably
unboubtedly
plainly=surely
可能：
probably
possibly
potentially
likely
presumably
perhaps
3. 分析性詞：
in the case
In this sense,...
So is ...
However, ...
True, ...
Following this trend, ...
Ironically, ...
No wonder that ...
Given that, ...
Granted that 姑且承認
almost
actually
literally=almost+actually
as a matter of fact
admittedly
Even if/though
No matter ...
to some extent
