不定式和動名詞作主語與表語比較

■表示一般的、泛指的或習慣性的行為用動名詞；表示具體的、一次性的或?qū)淼膭幼饔貌欢ㄊ健Ｈ纾?/SPAN>

Swimming is fun in summer. 夏天游泳是有趣的事。

Swimming in this river is a great pleasure. 在這條河里游泳是件非�？鞓返氖�。

注：有時這種區(qū)別并不很嚴格。但要注意：主語和表語要用同一種形式；平行結(jié)構(gòu)中要用同一種形式。如：

To see is to believe. =Seeing is believing. 眼見為實。

Fishing is his favorite hobby, and collecting coins also gives him great pleasure 釣魚是他的愛好，集郵也給他帶來極大的樂趣。

■口語中，陳述句多用不定式作主語，而疑問句卻總是用動名詞作主語。如：

Is doing morning exercises good for your health? 做早操對你身體有好處嗎？

■下列句子中通常用動名詞：

It’s no good/use talking to him. 找他談是沒有用的。

It’s useless discussing the matter. 討論此事無益。

There is no stopping him. 無法阻止他。

No parking! 禁止停車！

■下列句中通常用不定式：

It took us two hours to get there. 去那里我們花了兩個小時。

It’s foolish of him to do so. 他這樣做是愚蠢的。

It is necessary for us to learn English well. 我們有必要學(xué)好英語。