1. 〔誤〕 He became a writter at his twenties 〔正〕 He became a writter in his twenties

　　　　〔析〕這句話應(yīng)譯為：他在20多歲時(shí)就成了作家。在某人的一段生活時(shí)間段中要用介詞in來表示，而在具體歲數(shù)時(shí)用at來表示。

　　　　2. 誤〕 We went to swim in the river in a very hot day. 〔正〕 We went to swim in the river on a very hot day.

　　　　〔析〕 具體某一天要用介詞on, 又如：on New Years Day

　　　　3. 〔誤〕 Im looking forward to seeing you on Christmas. 〔正〕 Im looking for ward to seeing you at Christmas.

　　　　〔析〕在節(jié)日的當(dāng)天用on，而全部節(jié)日期間用at,Christmas是圣誕節(jié)期間，一般要有兩周或更長的時(shí)間。

　　　　4. 誤 I havent see you during the summer holidays. 正 I havent seen you since the beginning of the summer holidays. 〔析〕 during表示在某一段時(shí)間之內(nèi)，所以一般不與完成時(shí)搭配，如：I visited a lot of museums during the holiday. 而for表示一段時(shí)間，可以用于完成時(shí)，如：I havent see you for a long time. 而through 用來表示時(shí)間時(shí)則為"整整，全部的時(shí)間"。如：It rained through the night.而since則是表達(dá)主句動(dòng)作的起始時(shí)間，一般要與完成時(shí)連用。

　　　　5. 〔誤〕 At entering the classroom, I heard the good news. 〔正〕 On entering the classroom, I heard the good news. 〔析〕 On 加動(dòng)名詞表示"一……就"。本句的譯文應(yīng)是：我一進(jìn)入教室就聽見這個(gè)好消息了。又如：on hearing… 一聽見， on arrival 一到達(dá)就……(on表示動(dòng)作的名詞)

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