一、后接人稱代詞用主格還是賓格
由于than既可用作連詞也可用作介詞，所以當(dāng)后接人稱代詞時(shí)，可用主格也可用賓格。通常認(rèn)為在正式文體中多用主格，在口語或非正式文體中多用賓語。如：
Everyone here is taller than I [me]. 這兒的每一個(gè)人都比我高。
Her sister swims faster than she [her]. 她姐姐游泳比她快。
但是，若人稱代詞之后跟有動(dòng)詞，則只能用主格。如：
Everyone here is taller than I am. 這兒的每一個(gè)人都比我高。
Her sister swims faster than she does. 她姐姐游泳比她快。
注意：有時(shí)用主格或賓格會(huì)導(dǎo)致意思的變化。比較：
I love you more than he (likes you). 我比他更愛你。
I love you more than (he likes) him. 我愛你勝過愛他。
二、后接動(dòng)詞用不定式還是動(dòng)名詞
1. 當(dāng)連接兩個(gè)非謂語動(dòng)詞時(shí)，通常應(yīng)使用一樣的形式。如：
It is much easier to get into debt than to get out of it. 借債容易還債難。
He likes playing chess more than watching TV. 與看電視相比，他更喜歡下棋。
比較：
He thinks it is safer to drive himself than (to) let me drive.
=He thinks that driving himself is safer than letting me drive. 他認(rèn)為他自己開車比讓我開車要更安全些。
2. 若不是連接兩個(gè)非謂語動(dòng)詞，則其后出現(xiàn)的動(dòng)詞通常用動(dòng)名詞形式(雖然也可用不定式，但不如用動(dòng)名詞普通)。如：
There are worse calamities than failing your driving test. 比起你駕駛考試不合格來說，更大的災(zāi)難還多著呢。
Nothing gives me more pleasure than listening to Mozart. 再?zèng)]有比聽莫扎特的樂曲更讓我高興的事了。
Nothing is more unpleasant than finding [to find] insects in your bath. 最使人不快的是在浴室里發(fā)現(xiàn)有蟲子。
三、引導(dǎo)比較狀語從句的時(shí)態(tài)問題
若than引導(dǎo)的比較狀語從句與主句動(dòng)作不一致，可以根據(jù)情況使用適當(dāng)?shù)臅r(shí)態(tài)形式。如：
He drives faster than he did a year ago. 他開車比一年以前快了。
The house is rather bigger than we thought. 這所房子比我們想的大得多。
若主句為將來時(shí)，than引導(dǎo)的從句可用現(xiàn)在時(shí)態(tài)表示將來，也可直接使用將來時(shí)態(tài)。如：
We’ll probably drive faster than you do [will]. 我們開車可能會(huì)比你們快。
四、引導(dǎo)比較狀語從句的倒裝問題
than引導(dǎo)比較狀語從句時(shí)，從句語序通常不需倒裝，但在正式文體中，有時(shí)也可倒裝。如：
City dweller have a higher death rate than country people do.
=City dweller have a higher death rate than do country people. 城市居民死亡率比農(nóng)村居民高。
五、引導(dǎo)比較狀語從句且在從句中充當(dāng)成分
有時(shí)可引導(dǎo)一個(gè)從句并在從句中充當(dāng)句子成分(主語、賓語、表語)，為便于理解，有時(shí)可視為than后省略了what：
We don’t want to do more than is necessary. 我們不想做不必要的事情。
The pain was almost more than he could bear. 這樣的痛苦幾乎使他受不了。
She’s not a very good manager she always spends more money than she earns. 她不大會(huì)理財(cái)——總是入不敷出。
Life here is much easier than it used to be. 如今在此地生活比起從前可舒服多了。
比較下面一句，than后的expected為省略結(jié)構(gòu)：
He returned three days earlier than (he was) expected. 他回來得比預(yù)料的要早三天。
六、后接時(shí)間或條件狀語從句
若語義需要，有時(shí)其后可接when引導(dǎo)的時(shí)間狀語從句以及if 引導(dǎo)的條件狀語從句。如：
You are a little fatter than when I saw you last. 你比我上次見你時(shí)胖點(diǎn)了。
Joe carries only nine pounds more than when he was twenty. 喬比他20歲時(shí)只重了九磅。
They work better together than if they are alone. 他們一起干比他們單干效果要好。
