oclock
[误] Its ten past five oclock.
[正] Its ten past five.
[析] oclock所表达的时间是正点，如果要表达的时间是几点几分或差几分几点都不能用oclock.
once
[误] Please come and see me once.
[正] Please come and see me one day.
[析] once用来谈论过去的事情，而不能谈论未来。如果要谈及未来要用one day, some time等。
[误] I met him one time when I was a student.
[正] I met him once when I was a student.
[析] 英语中一次应用once而不用one time，二次要用twice而不用two times.
one
[误] My grandfather wants to live for hundred years.
[正] My grandfather wants to live for one hundred years.
[误] He threw away the old dictionary and wanted to buy new one.
[正] He threw away the old dictionary and wanted to buy a new one.
[误] His dog is bigger than my one.
[正] His dog is bigger than mine.
[析] 一般物主代词之后不用one，除非one前有修饰词，如my old one， 否则要用名词性物主代词。
[误] One of the teacher is in the office.
[误] One of the teachers are in the office.
[正] One of the teachers is in the office.
[析] One是句子的主语，其谓语动词应用单数，而of后面的名词要用复数名词。
[误] One third of the books is sent to the students.
[正] One third of the books are sent to the students.
[析] 几分之几或百分之几这一结构用在主语位置，其谓语动词要与of后面的名词一致，如Two thirds of the work is done.
open
[误] Are the banks opened today
[正] Are the banks open today
[析] 要注意open即可用作动词、名词，还可以用作形容词，而close则不同。请看： Are the banks closed today这一句是正确的。
or
[误] He doesnt drink and smoke.
[正] He doesnt drink or smoke.
[析] 否定句中的并列连词要用or而不用and.
[误] He neither drinks or smokes.
[正] He neither drinks nor smokes.
other
[误] Where are the others students
[正] Where are the other students
[正] Where are the others
[析] other作形容词时没有复数形式，且作为泛指讲时没有定冠词，如： Ask some other eople. 而加定冠词后为特指。 the other可在句中作主语、宾语或定语，如： Now let me show you the other. (宾语) He has two sons. One is a worker, the other is a teacher. (主语) others 只能作代词，而the others则为特指，如： There are five books. Two of them are not good. I like the others.
out
[误] She went out the classroom, taking a dictionary with her.
[正] She went out of the classroom, taking a dictionary with her.
[析] out of是指从里出来，使用时不要将of丢掉。
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