2. 當整個從句被省略時，可用so來代替。這樣的主句謂語動詞有：think, believe, guess, suppose, hope, be及疑問副詞why, how, if等。如：

(1) —Do you think the thief will be put into prison? 你認為那個賊會被打入監牢嗎？

—Yes. I think so. 是的，我認為會。

(2) —Do you believe that he will come back from abroad? 你認為他會從國外回來嗎？

—Yes. I believe so. 是的，我認為他會回來。

(3) —It is said that Mary got her arm broken. 據說瑪麗把手臂弄斷了。

—How so. 怎么會這樣呢。

(4) —He must be in the classroom now. 他現在肯定在教室里。

—If so, let’s go to the classroom to see him. 如果她在教室里，我們就去那兒看他吧。

3. 當從句為否定，而整個從句被省略時，可寫為don’t…so, 也可只保留從句中的not。這樣的主句動詞有：think, believe, suppose等。如：(www.hz123456.com)

(1) —Do you think he will change his idea? 你認為他會改變主意嗎？

—No. I don’t think so. 不，我認為他不會。

(2) —Do you think English is difficult? 你認為英語難學嗎？

—No. I don’t think so. 不，我認為不難學。

四、從句中的引導詞省略后，主謂倒裝

在虛擬條件句中含有were, should, had 時，可將 if 省略，同時將 were, should, had 提到句首。如：

(1) Were I there, I would stop him doing that. 要是我在那兒，我就會阻止他那樣做。

(2) Had he learnt English, he would be studying abroad. 要是他以前學過英語，他會正在國外學習。

(3) Should he like swimming, I couldn’t stop him. 要是他喜歡游泳，我可阻止他不了。

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