為什麼這篇better than文法鄉民發文收入到精華區：因為在better than文法這個討論話題中，有許多相關的文章在討論，這篇最有參考價值！作者scju (QQ)看板Eng-Class標題[文法] than to的對稱性問題時間Thu Se...
大家好，請教一下
OALD9裡頭寫道:
than
preposition, conjunction
例句：
You should know better than to behave like that.
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想問的是，than這個字不是應該都可以用句子左右對稱的方式來理解嗎？例如：
I'm older than she (is old).
He loves me more than you (love me或直接用do).
It was much better than I'd expected (it was).
但這個例句我就不曉得應該怎麼改才行了
You should know better than to behave like that.
主要是better than後面為何會多一個to?
如果沒有to的話就可以懂：
You should know better than behave like that.
可寫成
You should know better than You behave like that.
但多了to我就無法理解了。
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於英語論壇詢問
網友Tdol回應
It means that the person behaved badly or incorrectly, when they should
know/should have known better.
https://goo.gl/HzghBZ
網友AlpheccaStars回應
"to behave like that" is an infinitive clause used as a noun. The infinitive
clause can be changed to a pronoun.
→You should know better than [that].
And the clause can be used as a subject:
[To behave like that] is unacceptable in this house.
https://goo.gl/zBtM9J
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可是似乎都沒有直接解答我的疑惑，我想問的就是，這個子句是不是可以用對稱的方式改
寫？應該如何改呢？
謝謝！
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※ 文章網址: https://www.ptt.cc/bbs/Eng-Class/M.1505396500.A.64F.html
※ 編輯: scju (36.226.129.251), 09/14/2017 21:42:17
→ sunny1991225: 把平行結構的想成Should後方的動詞原型know和to beh 09/14 22:59
→ sunny1991225: ave就ok了吧 09/14 22:59
→ sunny1991225: 兩邊其實都是動詞原型只是一個有to一個沒有而已... 09/14 23:00
→ sunny1991225: 不知道這樣清不清楚:You should know better than t 09/14 23:07
→ sunny1991225: o behave like that better 09/14 23:07
→ sunny1991225: 這邊的better是當副詞用 09/14 23:09
感謝sunny大回應，其實我有這樣想過，但又想到should後應該不能接to+原形動詞這種句型，例如：
You should to behave like that. (錯誤)
You should behave like that. （正確）
所以我就不曉得那個多出來的to該如何處理？QQ
※ 編輯: scju (36.226.129.251), 09/14/2017 23:40:46
→ sunny1991225: 剛剛想了一下，我的回答應該不對 09/15 00:10
→ sunny1991225: know better than這種句型沒有限定前面要有modal 09/15 00:11
→ sunny1991225: verbs 09/15 00:11
→ sunny1991225: 其實我的語感讓我開始懷疑這裡的know應該是及物動詞 09/15 00:18
→ sunny1991225: ，後方的better不是當副詞而是形容詞用(換句話說有 09/15 00:18
→ sunny1991225: 個隱藏的名詞，可能是it或是什麼東西之類的，總之和 09/15 00:19
→ sunny1991225: 後方作名詞的不定詞對等(都是名詞 09/15 00:19
→ sunny1991225: 但一時間也找不到什麼有力的證據支持這種說法..... 09/15 00:20
→ sunny1991225: (我的意思是"I know better things than to do v.) 09/15 00:22
確實是很有啟發的想法喔！附上劍橋辭典的解釋 https://goo.gl/jRnxKa
感覺好像就只是當個慣用句型來用...
※ 編輯: scju (36.226.129.251), 09/15/2017 00:25:52