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【正文】 . 先找出謂語(yǔ)動(dòng)詞； 2. 再找出謂語(yǔ)動(dòng)詞后的賓語(yǔ)； 3. 把賓語(yǔ)用作被動(dòng)語(yǔ)態(tài)中的主語(yǔ)； 4. 注意人稱、時(shí)態(tài)和數(shù)的變化。Ⅰ.動(dòng)名詞和不定式做主語(yǔ)的相同點(diǎn)，常常為了保持句子的平衡，用it來(lái)做形式主語(yǔ)，如：It is not easy to learn English well.It is no use asking him for help.,表語(yǔ)和賓語(yǔ)也要用不定式。主語(yǔ)用了動(dòng)名詞,表語(yǔ)和賓語(yǔ)也要用動(dòng)名詞,這在英語(yǔ)中稱為對(duì)稱性,如:To see is to believe. = Seeing is believing. (眼見(jiàn)為實(shí))(85)It is better to stay home than _A__ out.A. to go B. going C. go D. goneⅡ.動(dòng)名詞和不定式做主語(yǔ)的不同點(diǎn)。表示泛指或一般的抽象的概念時(shí),多用動(dòng)名詞,如:(92)_B_ is a good form of exercise for both young and old.A. The walk B. Walking C. To walk D. Walk”There/It +be+ no use(good/help/need)”之后常用動(dòng)名詞做主語(yǔ),而少用不定式,如:It /There is no use crying over the split milk.It /There is no help taking this medicine.★但是如果該句型中用了for引出不定式的邏輯主語(yǔ),就只能用不定式,如:(93) There is no good for us to do that exercise., where, how, what, whether等連用,在句子中做主語(yǔ),賓語(yǔ)和表語(yǔ),而動(dòng)名詞則不能,如:How to solve the problem is a hot potato.Where to put the box seems hard to decide.Whether to do it hasn’t been decided.What to do next is up to you.不定式作主語(yǔ)通常表示一次性、未來(lái)的且具體的特指動(dòng)作。 而動(dòng)名詞作主語(yǔ)通常表示習(xí)慣性、經(jīng)常性和不具體的泛指動(dòng)作。 動(dòng)名詞作主語(yǔ)和不定式作主語(yǔ)有時(shí)可以互換,例如:It is dangerous playing (to play) with fire. Seeing is believing. / To see is to believe. 動(dòng)名詞與不定式在作主語(yǔ)的時(shí)候，是存在語(yǔ)義上的差別的。 動(dòng)名詞作主語(yǔ)，傾向于陳述一個(gè)既定事實(shí)。 比方說(shuō)：sleeping is 。 schooling costs a family a 。 但是不定式作主語(yǔ)，傾向一個(gè)因果關(guān)系、邏輯關(guān)系。 比方說(shuō)：to say goodbye to all of you my friends is hard for 。 to waste other39。s time means chronic 。 不定式作主語(yǔ)強(qiáng)調(diào)具體，動(dòng)名詞強(qiáng)調(diào)泛指如： Doing morning exercise is good for health. 泛指早操對(duì)人人都有好處 To do morning exercise these days is good for your health. 特指對(duì)某人某時(shí)的用處 在英語(yǔ)里 發(fā)生在過(guò)去的動(dòng)作要用過(guò)去式；發(fā)生在現(xiàn)在的，分兩種，一種是一般現(xiàn)在時(shí)，用原形，現(xiàn)在進(jìn)行時(shí)要用進(jìn)行時(shí)， 將來(lái)的動(dòng)作 一般動(dòng)詞也用原形，前面加will 等 如：be doing about doing ....... 過(guò)去時(shí)態(tài)+ed 反正動(dòng)詞原形就什么也不加
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