假設語氣 | 文法中心

核心概念：語氣 vs 時態

假設語氣表示「與事實相反」或「非真實」，動詞形式往往「退後一個時態」(過去式表現在、過去完成式表過去)。

類型	結構	意義	例句
條件句 Type 2	If + 過去式, would + V	對現在/未來非真實	If I were you, I would accept.
條件句 Type 3	If + had + Vpp, would + have + Vpp	對過去非真實	If I had known, I would have come.
wish 願望	wish + 過去式/過去完成式	對現在/過去不滿	I wish I were taller. / I wish I had gone.
as if/though	as if + 過去式/過去完成式	彷彿...樣子	He talks as if he knew everything.
It's time	It's time + 主詞 + 過去式	該做某事了	It's time we went home.
would rather	would rather + 主詞 + 過去式	寧願...	I'd rather you came tomorrow.

suggest, recommend, propose, demand, require, insist, order

I suggest (that) he go at once. (原形動詞)

necessary, important, essential, vital, imperative

It is necessary (that) he be present. (be 原形)

英式英語可用 should + V；美式偏好原形動詞

I suggest (that) he should go / go.