新一輪中考復(fù)習(xí)備考周期正式開(kāi)始，中考網(wǎng)為各位初三考生整理了各學(xué)科的復(fù)習(xí)攻略，主要包括中考必考點(diǎn)、中考常考知識(shí)點(diǎn)、各科復(fù)習(xí)方法、考試答題技巧等內(nèi)容，幫助各位考生梳理知識(shí)脈絡(luò)，理清做題思路，希望各位考生可以在考試中取得優(yōu)異成績(jī)！下面是《2018中考英語(yǔ)知識(shí)點(diǎn)：從屬連詞用法》，僅供參考！
從屬連詞用法：
從結(jié)構(gòu)上說(shuō)，英語(yǔ)連接詞分兩大類(lèi)：并列連詞和從屬連詞。
并列連詞連接兩個(gè)或兩個(gè)以上地位平等的字、詞組或分句。例如：
(1) Air and water are indispensable to me.
(2) She likes going out with friends or playing outdoor games.
(3) Most workers have a good income, so they look very happy.
從屬連詞連接兩個(gè)或兩個(gè)以上的分句，形成復(fù)雜句中的從屬分句。例如：
(4) He said that he did not want to go .
(5) Many things have happened since I last saw him.
(6) You may come if you want to.
從屬連詞用來(lái)連接各種從句。
until(till)直到，在用until表達(dá)時(shí)間狀語(yǔ)的句子中，主句中的動(dòng)詞是要十分小心去選擇的。
如動(dòng)詞是持續(xù)行動(dòng)詞，它要用肯定句，如：
I studied hard until 12 o'clock last night.
如果動(dòng)詞是瞬間截止性動(dòng)詞，則要用否定句，如:
He didn't go to bed until his mother came back.
由since,for,by,before, 來(lái)引導(dǎo)的時(shí)間狀語(yǔ)從句。
since 引導(dǎo)的時(shí)間狀語(yǔ)是動(dòng)作的開(kāi)始時(shí)間，如:
I have studied English since 1990.
而by引導(dǎo)的時(shí)間狀語(yǔ)通常是動(dòng)作的結(jié)束時(shí)間，如：
I had learned 25 English songs by the end of last term.
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