2、as if / though 引導的狀語從句，時常用虛擬語氣，表示與事實不符或相反的情況

　　He spoke in that way as if he were a foreigner. 他講話的方式就好像是老外。

　　3、as + adj. + a + 可數單數名詞 + as … ：as---as 像---一樣：第一個as是副詞，修飾形容詞或副詞的'原級;

　　第二個as是連詞，引導比較狀語從句。在否定句中也可以改為not as(so)---as-----.

　　The film was not as/so good as I had expected. 這部電影不如我預期的好。

　　4、be about to do sth…when… 正要干……這時…… when == at that time

　　I was about to leave when the manager called me back. 我正要離開時,經理叫住了他。