Unit5 Canada-“The True North”-grammar學案
由于以上區別，所以動詞 doubt后接賓語從句時，通常要用 whether (if) 來引導，而不用 that，因為 doubt 表示“懷疑”，其意不肯定、不明確；但是如果它用于否定式，其后的賓語從句則要通常用 that 來引導，因為 not doubt 表示“不懷疑”，其意是肯定的、明確的。如：i doubt if [whether] he’ll come. 我拿不準他是否會來。i don’t doubt that he will succeed. 我敢肯定他會成功。do you doubt that he will win? 你不相信他會贏嗎?【注】在現代英語中，doubt用于肯定式時其后也可接that從句，不過此時的that仍表示whether的意思：i doubt that we’ll ever see george again. 我懷疑我們是否還會見到喬治。(from )類似地，be sure后的名詞性從句通常用that引導，而 be not sure 后的名詞性從句則通常用whether / if 來引導：i’m sure that he is honest. 我肯定他是誠實的。i’m not sure whether (if) he is honest. 我不敢肯定他是否誠實。考例回顧1. the girls were surprised at the fact that ocean ships can sail up the great lakes. (p34)[考點] 同位語從句。[考例1] a warm thought suddenly came to me _____ i might use the pocket money to buy some flowers for my mother’s birthday.(安徽)a. if b. when c. that d. which（注意： 斜體部分為最佳選項。下同）[點撥] that引導的同位語從句解釋說明thought的內容。[考例2] —it’s thirty years since we last met.—but i still remember the story, believe it or not, _____ we got lost on a rainy night. (四川)a. which b. thatc. what d. when[點撥] that引導的同位語從句解釋說明story的內容。believe it or not為插入語。[考例3] do you have any idea _____ is actually going on in the classroom? (遼寧)a. that b. whatc. as d. which [點撥] 考查what引導的同位語從句，what在從句中作主語。2. at school, they had learned that most canadians live within a few hundred kilometres of the usa border... (p34)[考點] within 介詞，在……（尤指時間、距離、范圍、限度等）之內，以內；在……里頭。[考例] don’t leave matches or cigarettes on the table within _____ of little children. (湖北)a. hand b. reach