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  • 1 # 使用者4090199212993

    主句在前的,一般不加。從句在前反而要加逗號。

    1、名從裡的從屬連詞that (無詞義,不做成分)

    if,whether (表達是否的意義,但不做句子成分)

    2、狀從裡的從屬連詞,before,after,since,if,because,though等。用法編輯在英語詞類中,連線詞可說是最容易掌握的一種。

    從屬連詞連線兩個或兩個以上的分句,形成複雜句中的從屬分句。

    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.

    從屬連詞用來連線各種從句。until(till)直到,在用until表達時間狀語的句子中,主句中的動詞是要十分小心去選擇的。

    如動詞是持續性動詞,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, 來引導的時間狀語從句。

    since 引導的時間狀語是動作的開始時間,如:I have studied English since 1990.

    而by引導的時間狀語通常是動作的結束時間,如:I had learned 25 English songs by the end of last term.

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