來源:網絡資源 作者:中考網整理 2019-08-25 19:39:26
中考英語知識點:when, while和as的區別
when引導的從句的謂語動詞可以是延續性的動詞,又可以是瞬時動詞。并且when有時表示"就在那時"。
When she came in, I was eating.她進來時,我在吃飯。(瞬時動詞)
When I lived in the countryside, I used to carry some water for him.當的住在農村時,我常常為他擔水。(延續性的動詞)
We were about to leave when he came in.我們就要離開,就在那時他進來了。
While引導的從句的謂語動作必須是延續性的,并強調主句和從句的動作同時發生(或者相對應)。并且while有時還可以表示對比。例如:
While my wife was reading the newspaper, I was watching TV. (was reading是延續性的動詞,was reading和was watching同時發生)
I like playing football while you like playing basketball.我喜歡踢足球,而你喜歡打籃球。(對比)
As表示"一邊…一邊",as引導的動作是延續性的動作,一般用于主句和從句動作同時發生;as也可以強調"一先一后。
We always sing as we walk.我們總是邊走邊唱。(as表示"一邊…一邊")
As we was going out, it began to snow.當我們出門時,開始下雪了。(as強調句中兩個動作緊接著先后發生,而不強調開始下雪的特定時間)
有時這三個連詞可以互換,有時不可以。
lt was raining hard when (as) I got there.
我到那里時,正在下大雨。 ( 動作同時發生,when可換為as, 但不能換為while,因為get是點動詞.)
When I had read the article, he called me.
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