2、as if / though 引導(dǎo)的狀語(yǔ)從句，時(shí)常用虛擬語(yǔ)氣，表示與事實(shí)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(shù)單數(shù)名詞 + as … ：as---as 像---一樣：第一個(gè)as是副詞，修飾形容詞或副詞的'原級(jí);
第二個(gè)as是連詞，引導(dǎo)比較狀語(yǔ)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(yù)期的好。
4、be about to do sth…when… 正要干……這時(shí)…… when == at that time
I was about to leave when the manager called me back. 我正要離開(kāi)時(shí),經(jīng)理叫住了他。