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2016年GMAT語法高分知識(shí)點(diǎn)：不定式的用法
在gmat考試中，不定式，如as to watch, to throw, 和to see是動(dòng)詞最基本的形式。不定式能做名詞、形容詞和副詞。下面隨百分網(wǎng)小編來看看詳細(xì)的不定式語法解讀吧!
Noun(作名詞): I love TO SWIM. To swim是動(dòng)詞love的賓語。
Adjective(作形容詞): The person TO MEET is here. To meet 修飾名詞person。
Adverb(作副詞): Sue paused TO EAT lunch. To eat修飾動(dòng)詞paused，表示目的。
上面第三個(gè)句子，不定式表示目的：why she paused or for what。這個(gè)句子也可以寫成：Sue paused in order to eat lunch.
in order to不wordy，盡管有同學(xué)認(rèn)為這個(gè)短語相對(duì)于to來說wordy。無論是否用短語in order to，要注意它們表示目的的作用�？聪旅孢@個(gè)例子：
Right: The contractors DEMOLISHED the building to keep it from falling down accidentally.
動(dòng)詞demolished的主語是名詞contractors，同時(shí)contractors也是不定式to keep的隱式主語(implied subject)，動(dòng)詞不定式to keep在這里表示demolished的目的，keep的賓語代詞it的先行詞是building。
Wrong: The building WAS DEMOLISHED to avoid falling down accidentally.
在這個(gè)例句中動(dòng)詞was demolished的主語是building，同時(shí)building也是不定式to avoid的隱式主語，但是a building自己不能avoid something intentionally。所以上面的例句是無意義的(nonsensical)。
再看下面這個(gè)例句
Right: The building WAS DEMOLISHED to keep it from falling down accidentally.
這個(gè)例句的主語是building，同時(shí)building也是不定式to keep的隱式主語，但是代詞it是不定式to keep的賓語，指代building。由于building是不定式to keep的賓語，所以上面的寫法也是正確的，表示的意思是the same unnamed people who demolished the building wanted to keep it from falling down accidentally.
注意，不定式雖然能做動(dòng)詞，但是不是名詞結(jié)構(gòu)。所以，雖然不定式能夠做主語，但是一般來說，GMAT語法用代詞it來指代主語，放在句首。
動(dòng)名詞(gerunds)-ing作名詞，與不定式相比，動(dòng)名詞更像名詞結(jié)構(gòu)，所以動(dòng)名詞既能做動(dòng)詞的賓語，又能做動(dòng)詞的主語，還能做介詞的賓語。如以下例句：
Subject of verb(作動(dòng)詞的主語):SWIMMING is fun. Swimming是is的主語。
Object of verb(作動(dòng)詞的賓語): I love SWIMMING. Swimming是love的賓語。.
Object of preposition(作介詞的賓語): I dream of SWIMMING. Swimming是介詞的賓語。
我們?cè)赾hapter 11中學(xué)過，動(dòng)名詞分為一般動(dòng)名詞和復(fù)雜動(dòng)名詞，動(dòng)名詞前面有冠詞的是復(fù)雜動(dòng)名詞�？匆韵吕�
Simple gerund: EATING apples quickly (more verb-like，更像動(dòng)詞)
Complex gerund: The quick EATING of apples (more noun-like，更像名詞)
記住，一般動(dòng)名詞與復(fù)雜動(dòng)名詞不能平行，同時(shí)當(dāng)相應(yīng)的動(dòng)作名詞存在時(shí)不要用復(fù)雜動(dòng)名詞，即the quick consumption of apples(動(dòng)作名詞)比thequick eating of apples(復(fù)雜動(dòng)名詞)好。
如果名詞是動(dòng)名詞所表示動(dòng)作的行使者，那么這個(gè)名詞必須是所有格的形式，如以下例句
Wrong: Mike SWIMMING is the product of new coaching techniques.
Right: Mike's SWIMMING is the product of new coaching techniques.
在用以上規(guī)則時(shí)，要檢查下，動(dòng)名詞是否是名詞?還是名詞的修飾詞，有時(shí)兩種用法都說得通，如以下例句
Suspect: I like Mike SWIMMING. (=名詞修飾語 I like Mike only as he swims, not as he runs? 當(dāng)Mike游泳時(shí)，我喜歡他?OR 名詞I like for him to be swimming rather than lifting weights?我喜歡Mike去游泳)
可以改成以下句子來避免歧義
Right: I like Mike's SWIMMING. (名詞= I like his swimming itself.)
Right: Mike SWIMMING is a sight to behold. (名詞修飾語Mike himself can be the sight.)
Right: Mike's SWIMMING is a sight to behold. (The swimming can be the sight.)
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