中考易混詞匯辨析：as/ when/ while

(1)as 是連詞，意思是"當(dāng)……的時(shí)候，一面……一面"，(強(qiáng)調(diào)同時(shí)，一般連續(xù)時(shí)間不長(zhǎng))，如：

As we were talking about Titanic, our teacher came in. 正當(dāng)我們談?wù)?泰坦尼克號(hào)"這部電影時(shí)，教師進(jìn)來了。

The students sing as they go along. 學(xué)生們邊走邊唱。

(2)When和as一樣都是連詞，注意它們的不同。如when"當(dāng)……的時(shí)候"(一般表示動(dòng)作緊接著發(fā)生);

"那時(shí)"(等立連詞，前有逗號(hào)分開)I stayed till sunset, when it began to rain. 我一直呆到太陽(yáng)下山，那時(shí)天開始下雨了。

(3)while是"當(dāng)……時(shí)候;和……同時(shí)"(強(qiáng)調(diào)同時(shí)發(fā)生，一般連續(xù)時(shí)間較長(zhǎng))例如：While I was watching TV, he was reading. 當(dāng)我在看電視的時(shí)候，他正在看書。While there is life, there is hope. 有生命就有希望。