O??

　　o'clock ??

　　［误］ It's ten past five o'clock.??

　　［正］ It's ten past five.??

　　［析］ o'clock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o'clock.??

　　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 doesn't drink and smoke.??

　　［正］ He doesn't 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.??