引導語：錯題本是會考英語的高分祕籍。他能讓我們總結錯誤思路，得到正確答案，大大提高我們的分數。以下是YJBYS的小編為大家整理的國中英語常見錯誤之U系列。希望對大家的學習能有所幫助!
under
[誤] The lake is two meters under sea level.
[正] The lake is two meters below sea level.
[析] under的意思是在某物的'下面，而below=lower than, 即"低於"。
[誤] Under the help of our teacher, all of us passed the exam.
[正] With the help of our teacher, all of us passed the exam.
understand
[誤] I think it is diffcult to make myself to understand.
[正] I think it is diffcult to make myself understood.
[析] 這句話的意思是"我想讓別人理解我太難了"。
[誤] I am understanding the lesson now.
[正] I understand the lesson now.
[析] understand一詞沒有進行時態。類似的詞還有belong, find, hear, love, like等。
until
[誤] We walked until the edge of the forest.
[正] We walked as far as the edge of the forest.
[誤] Our school bus can hold until twenty children.
[正] Our school bus can hold up to twenty children.
[析] until與till兩詞的意思一樣，但兩個詞都只能用於時間，如： I'll wait until I hear from you.
[誤] I waited for my mother to seven o'clock, but she didn't come.
[正] I waited for my mother until seven o'clock, but she didn't come.
[誤] Can you return this book until Monday
[正] Can you return this book by Monday
[析] 當我們談目前正在進行而將來某一時刻才停止的事件時用until，而用by來表達將來某一時刻會發生的動作。
[誤] We arrived home until it became dark.
[正] We didn't arrived home until it became dark.
[析] until用於肯定句時表示"某動作直到……為止"，如： They worked until 5∶00 P. M. 用於否定句中時意為"直到……才"。所以用於肯定句中要使用延續性動詞，但截止性動詞卻可以用在否定句中。
upstairs
[誤] He went to upstairs.
[正] He went upstairs.
[析] upstairs一詞可用作副詞，如： We all hurried upstairs to see what happened. 也可用作名詞，如; The upstairs of the house needs painting. 同時也可以用作形容詞，如： A house with three upstairs rooms is quite good.
use
[誤] It is no use to ask her.
[正] It is no use asking her.
[析] It is no use…與There is no use…後通常用動名詞，而不用不定式。
[誤] I'll get used to treat the students this way.
[正] I'll get used to treating the students this way.
[析] be used to與get used to後要接動名詞表示"習慣於"做某事。
[誤] I used to getting up early in the morning.
[正] I used to get up early in the morning.
[析] used to表示過去習慣的動作，其後要加動詞原形。
[誤] Oil was used to cooking.
[正] Oil was used to cook.
[析] 這裡的句型雖然也是be used to但這裡不是主動態，而是被動態，所以不能接動名詞而應接不定式。
[誤] We used to go to the Great Wall three times.
[正] We went to the Great Wall three times.
[析] used to只能用來表示一種習慣，而不能用來表達某事發生的次數。
