sure和certain的區(qū)別

1、【精品文檔】如有侵權(quán)，請聯(lián)系網(wǎng)站刪除，僅供學(xué)習(xí)與交流sure和certain的區(qū)別.精品文檔.It isthat結(jié)構(gòu)中只能用certain，不能用sure。Sure與certain是近義詞，均作“一定的，確信的”等解。兩者用法相似，多數(shù)情況下可換用，但有時(shí)不能換用。其用法區(qū)別大致如下：一、 兩者可換用的情況：1 跟不定式，可用人或物作主語。例如：It is sure/certain to rain.He is sure/certain to come.Youre sure/certain to be happy with them.2跟連接代/副詞引起的不定式，常用人作主語。例如：Im not

2、 sure/certain what to do.He was not sure/certain when to start.3跟of或about引起的短語。sure后可跟of doing sth. 常用人作主語。例如：Im not sure/certain of that.Are you sure/certain about it?Im sure of his coming.Hes sure of winning.注：sure to do sth.與sure of doing sth.的區(qū)別：前者表示說話者認(rèn)為“主語一定”；后者表示“主語自認(rèn)為一定”。例如：He is sure to suc

3、ceed. (說話者認(rèn)為“他”一定會成功。He is sure of succeeding. (“他”自己認(rèn)為一定成功)4跟that引起的從句，常用人作主語。例如：Im sure/certain that hell come.I was sure/certain (that) he had seen me.Im quite sure/certain I left the book on the table.注：當(dāng)sure或certain用于否定句時(shí)，其后跟whether或連接代/副詞引起的從句，不跟that引起的從句。例如：Im not sure/certain whether Ive met

4、 him before.Im not sure/certain whether he will come.Im not sure/certain who he is.I was not sure/certain what I ought to do.Im not sure/certain why he wants it.以上幾種情況中的sure與certain雖可換用，但隱含意思不同。Sure表示主觀的推測或感覺，所述事實(shí)并不一定如此；certain則指說話者有充分的理由或根據(jù)，肯定某事會發(fā)生。如下面兩句中的certain均不可用sure替換。例如：Im certain he wasnt in

5、 the classroom. I saw him in the library.Im certain than he will go the concert. He told me so an hour ago.5與make連用構(gòu)成短語，后跟從句，作“弄清楚；設(shè)法做到”解。例如：Make sure/certain when the train leaves.Have you made sure/certain that the train has already left?6與for連用構(gòu)成短語，在句中作狀語。作“確實(shí)；毫無疑問”解。例如：I dont know for sure/certa

6、in that hes dead.I cannot sau for sure/certain when he will come.二、 兩者不可換用的情況：1 在“It isthat結(jié)構(gòu)中只能用certain，不能用sure。例如：It is certain that he will come.It was certain that our football team would win the game.如是否定句，用whether，不同that。例如：It is not certain whether he will come.2 在祈使句中通常用sure，不用certain。例如：Be

7、sure to tell me all the news.Be sure and come as soon as possible.Be sure you dont upset any of them.3作定語時(shí)，sure作“有把握的；肯定的；可靠的”解；certain作“某個(gè)；某些”解。例如：Put it in a sure place.There was only one sure way to succeed.A certain person called on me yesterday.Certain students have failed in the exam.4Sure在美語中可用作副詞作肯定答語，用以代替surely，相當(dāng)于certainly，of course；而certain則不能用作副詞。例如：I wonde