英國文法大師 Alexander L G寫過名作Advanced Grammar和New Concept English，他鼓勵學習英語的人多用片語動詞 (phrasal verb)。 他舉了一個很有趣的例子：你聽到有人敲門，你會不說"Enter"，而是用：Come in 。 常看影集的人可能會用：Come on in 。說Come in 也好，Come on in 也好，二者都是片語動詞，也是英美兩國人脫口而出的常用語。
美國人喜歡用"come on in"，英國人用"come in"。Alexander是英國學者，所以他說："有人敲門時，我們常說‘Come in'而不說‘enter'。" "come on in"是三字一體的片語，三字一體的片語動詞中，含"on"的相當多。
過去談過幾次片語動詞，但我們多半談兩個字組成的片語動詞，今天介紹給讀者的是含"on"的三字一體片語。每一個片語用一分鐘時間讀，讀過後，眼睛不看報紙，看看自己能不能把例句再說一遍，說出來，就過關了。 以下10句，只要10分鐘，你的片語起碼就過了第一關。
1. cash in on：謀取利益
"The shop be cash in on temporary shortage by raising price 商家趁一時缺貨而提高價格從中獲利."
2. zero in on：鎖定、對準目標
"The police have ZEROED IN ON the man they believe to be responsible for the murder."
3. clamp down on：施加壓力；取締
"The government has decided to clamp down on all forms of illegal gambling."
4. read up on：熟讀
"You need to read up on all the traffic codes before you learn driving."
5. brush up on：復習
"Before the examination, remember to sort out the lecture notes to brush up on all the important points."
6. check up on：檢查
"The manager asked the secretary to check up on all the files before posting them."
7. come down on：堅决要求；處罰
"The bank came down on its debtors for immediate payment."
8. get in on：分享；參與
"The company tried to get in on our market."
9. cut down on：减少；削减
"Companies started to cut down on their expenses during the economic downturn."
10. fall back on：求助於
"He has spent all his savings and now has nothing to fall back on."
引用來源: http://www.core-corner.com/Web2/index.php?stat=EEC
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