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sure 既可用做形容词,也可用作副词,作形容词时,意为“肯定,确信,有把握.”常用以下句形.
1）be sure of /about 相信,确信.如：I am sure of /about his success .我确信他会成功. 2）be sure to 一定,务必 .如：Be sure to come earlier tomorrow .请明天必须早点来. 3）be sure +that 从句 .如：I am sure (that) I left the book on the desk .我肯定把书忘在桌子上了. 4）be sure +wh-从句 .如：They’re not sure whether they could come or not .他们不能肯定能不能来. 5）be sure +wh-词+不定式.如：I am not sure where to go .我不能肯定到什么地方去. 用作副词时,一般取“当然,当然可以”之意.此时可与certainly,of course换用.如：---Could you lend me your bicycle ---Sure . certainly 为certain 的副词.1) “确实的,无疑的”.在肯定句和疑问句中,certainly 用于be动词,助动词,情态动词后,行为动词前.在否定句中.certainly 用于be动词,助动词,情态动词之前如：He will certainly come .We certainly mustn’t forget that .2）用在答语中表示“当然可以,没问题.”此时可以与sure,of course 换用. |
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沙发#
发布于：2018-11-18 22:42
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