從屬連詞用法：

從結(jié)構(gòu)上說，英語連接詞分兩大類：并列連詞和從屬連詞。

并列連詞連接兩個或兩個以上地位平等的字、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.

從屬連詞連接兩個或兩個以上的分句，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.

從屬連詞用來連接各種從句。

until(till)直到，在用until表達(dá)時間狀語的句子中，主句中的動詞是要十分小心去選擇的。

如動詞是持續(xù)行動詞，它要用肯定句，如：

I studied hard until 12 o'clock last night.

如果動詞是瞬間截止性動詞，則要用否定句，如:

He didn't go to bed until his mother came back.

由since,for,by,before, 來引導(dǎo)的時間狀語從句。

since 引導(dǎo)的時間狀語是動作的開始時間，如:

I have studied English since 1990.

而by引導(dǎo)的時間狀語通常是動作的結(jié)束時間，如：

I had learned 25 English songs by the end of last term.

相關(guān)推薦：　

　　2022年中考各科目重點知識匯總
 

關(guān)注中考網(wǎng)微信公眾號 

每日推送中考知識點，應(yīng)試技巧

助你迎接2023年中考！

　　 歡迎使用手機、平板等移動設(shè)備訪問中考網(wǎng)，2023中考一路陪伴同行！>>點擊查看