as if / as though 從句用虛擬語氣的格式

以as if (as though)引導的方式狀語從句或表語從句，有時用虛擬語氣，若表示與現在事實相反，謂語動詞用一般過去時；若表示與過去事實相反，用過去完成時；表示將來的可能性不大，用would (might, could)+動詞原形。如：

I love you as if you were my son. 我愛你就像你是我的兒子。

When a pencil is partly in a glass of water, it looks as if it were broken. 當把一支鉛筆的一部分放在一杯水里時, 它看起來好像折斷了似的。

注：有時虛擬語氣并不明顯(特別是主句動詞為過去時時)。如：

He paused as though he found a difficulty. 他停了下來，仿佛遇到什么困難似的。

若從句所表示的內容為事實或可能為事實，也可用陳述語氣。如：

It seemed as though he didn't recognize me. 他似乎沒認出我來。

在現代英語中，有時即使從句內容不是事實，也可能用陳述語氣：

I feel as if [as though] I’m floating on air. 他感到好像漂浮在空中。

The stuffed dog barked as if it is [were, was] a real one. 玩具狗叫起來像真狗。

另外，注意 It isn’t as if…的翻譯。如：

It isn’t as if he were poor. 他不像窮的樣子(或他又不窮)。

It isn’t as if you were going away for good. 又不是你離開不回來了。