高考英語第二輪專題復習Unit 5 Rhythm語法解讀
我走向學校時,見到了約翰遜先生。
as(when,while)we were still laughing,the teacher came in.
我們還在大笑時,老師進來了。
i entered while(as,when) the meeting was going on.
會議正在進行時，我進來了。
2.兩個一般時的長動作相并進行的時候,as,when,while都可用作連詞。如：
he sang as(while,when) he worked.他一邊干活,一邊唱歌。
her voice trembled as(while,when) she spoke.
她講話時,聲音發顫。
3.兩個進行時的長動作相并進行的時候,when,while可用作連詞,as不可以。如：
mary was cooking supper while(when) her brother was playing chess.
瑪麗在做晚飯,那時她弟弟在下棋。
xiao yang was singing happily while(when) he was driving home.
小楊開著車回家時,高興地唱著歌。
4.兩個短動作相并進行的時候或事件同時緊接著發生時,as,when可用作連詞,while不可以。如：
he arrived just as(when) i stepped out of the room.
就在我跨出房門時他到了。
she thought of him when (just as) she caught sight of the pavilion.
就在她猛地看見那亭子時,想到了他。
he rose as (when) she entered.她進來時他站了起來。
5.從句以系表結構表示狀態時,when能用作連詞,while間或能用來表示“在……期間”。如：
when it is wet,the buses are crowded.
下雨天公共汽車就擁擠。
i left school when it was dark.天黑了我離開了學校。
he went back to his home when he was 65.
他65歲時,返回故里。
6.不論從句還是主句,只要有一方用了完成時態,只有when能用作連詞。如：
hardly i had finished my composition when the bell began to ring.
我剛剛寫完作文,鈴就響了。
when we got to the cinema,the film had begun.
我們到電影院時,電影已經開演了。
7.如果從句用瞬間性動詞,主句用延續性動詞,從句只能用when引出。如：
when he came this morning,we were having an english lesson.
今天上午他來的時候,我們在上英語課。
father was writing something when i left home.
我從家出來時,父親在寫什么東西。
8.在表示時間上,while不能指時間的一點,因此while所引出的從句,謂語通常用延續性動詞的一般時或進行時。如：
please write while i dictate.請在我口述時,聽寫下來。
i kept silent while he was writing.他寫作時,我默不作聲。
9.在表示對比時,while作“然而”解,從句可用“系表結構”或延續性動詞作謂語。如：
he is lazy while his brother (is) diligent.他懶惰,而他弟弟勤奮。
he was riding while his father walked in the dust.
他在騎著馬,而他父親在塵埃中步行。
10.while 還可以作“雖然”“趁著”“只要”解。如：
while i like the colour of the hat,i don’t like the shape.
我雖然喜歡這頂帽子的顏色,但我不喜歡這樣式。
make hay while the sun shines.趁著天晴曬干草。
在個別情況下,while從句用瞬間性動詞,表示“在……的同時”。如：
while he left,he remembered the key.
在他走的當兒,他想起了鑰匙。