6. 〔誤〕 In the beginning of the book, there are some interesting stories. 〔正〕 At the beginning of the book, there are some interesting stories. 〔析〕 at the begining與at the end都是指某事物的開始與結(jié)束部分，均不指時(shí)間范圍，而in the beginning 則是指開始一段時(shí)間。in the end=at last是指"最終，終于"之意。

　　　　7. 〔誤〕 Till the end of next week. I will have finished this work. 〔正〕 By the end of next week. I will have finished this work. 〔析〕 by 引起的時(shí)間狀語(yǔ)表示了動(dòng)作的截止點(diǎn)，其意思為"不遲于某一時(shí)刻將工作做完"，所以主句一般是完成時(shí)態(tài)。當(dāng)然可以有將來(lái)時(shí)態(tài)，如：Ill be there by five oclock.而till則表達(dá)其一動(dòng)作一直持續(xù)到某一時(shí)刻，但句中的動(dòng)詞一定要用持續(xù)性動(dòng)詞，而瞬間的截止性動(dòng)詞應(yīng)用其否定句式，如：I wont finish this work till(until) next weekend.

　　　　8. 〔誤〕 He came to London before last weekend. 〔正〕 He had come to London before last weekend.

　　　　〔正〕 He came to London two weeks ago. 〔析〕 before 一般要與完成時(shí)連用，而ago則與一般過(guò)去時(shí)連用。

　　　　9. 〔誤〕I have studied English for three years gince I had come here.正 I have studied English for three years since I came here. 析 since用來(lái)表達(dá)主句動(dòng)作的開始時(shí)間，所以其引出的從句中應(yīng)為過(guò)去時(shí)，而不能用完成時(shí)態(tài)

　　　　10. 〔誤〕 I can help you repair this bike. You will get it after two hours. 〔正〕 I can help you repair this bike. You will get it in two hours. 〔析〕中文經(jīng)常講兩小時(shí)之后來(lái)取，兩天內(nèi)會(huì)修好，而這個(gè)介詞在英文中要用in而不要用after。其原因有二，①after 多用于過(guò)去時(shí)，如：I arrived in New York. After three days, I found a job in the bank. ② after 加時(shí)間是表達(dá)一個(gè)不確定的時(shí)間范圍，如：after three days, 即三天之后的哪一天都可以。所以在許諾若干時(shí)間內(nèi)會(huì)完成某事時(shí)，一定要用介詞in。

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