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2025年12月六级语法：sure与certain的用法与别离

　一、两者在用法上的疏通点

两者王人可用作表语，示意“一定”或“确信”，无意可互换。互换的场面应郑重以下几点用法：

1. 示意话语者的魄力或主意

即示意话语者我方的魄力或主意，其意为“一定会”“确信会”。此时主要用法有：

(1) 单独用作表语。如：

One thing was sure [certain]: they'd be late. 有一件事是细则无疑的，他们会迟到。

(2) 后接不定式。如：

He's certain [sure] to win. 他一定会到手。

They're certain [sure] to need help. 他们确信需要匡助。

If you do this, you are certain [sure] to be found out. 若是你这么作念一定会被发现。

2. 示意句子主语的判断或信念

即示意句子主语对某一情况的判断或信念，其意为“信托”“确信”“有把抓”等。此时频繁用于以下结构：

(1) 后接of [about] sth。如：

He is certain [sure] of success. 他确信会到手。

Are you certain of [about] that? 你对此有把抓吗?

(2) 后接 of doing sth。如：

Our team is certain [sure] of winning. 咱们队有把抓赢。

You can be sure [certain] of his agreeing. 你不错宽心他会喜悦。

相比同义句：

He is certain [sure] of winning.

=He is sure [certain] that he will win. 他自信会赢。

(3) 后接 that / whether / if 从句。如：

I am sure [certain] that he is honest. 我确信他是教师的。

I'm sure [certain] that it's not your fault. 我敢确信这不是你的错。

Are you certain [sure] that this is the right road? 你确信这条路对吗?

注：当be sure [certain]为确信式或疑问式时，后接that从句;当be sure [certain]为狡赖式时，后接whether [if]从句。如：

I'm not sure [certain] whether he still works there. 我不行确信他是否还在那里责任。

I wasn't sure [certain] whether he would agree. 我不太确信他是否会喜悦。

He wasn't sure [certain] whether he would be able to get back in time. 他不行确信他是否能准时追溯。

(4) 后接其他从句。如：

I'm not sure [certain] where she lives. 我不行确信她住在那边。

I'm not certain [sure] who wrote it. 我不太明晰这是谁写的。

二、只可用certain的情形

以下情况频繁只用certain，而无谓sure：

1. 当句顶用了相貌主语或相貌宾语 it 时。如：

It's certain that he'll come tomorrow. 他未来确信会来。

I thought it certain that he would be late. 我确信他会迟到。

It's certain that prices will go up. 价钱确信会上升。

It's not certain how much it will cost. 这要花若干钱还不细则。

2. 当示意“某一”“某些”时。如：

A certain Mr Green wants to see you. 有个叫格林先生的东谈主思见你。

Certain plants are good to eat but others are not. 有些植物厚味, 而其他一些则不厚味。

三、只可用sure的情形

在 Be sure (not) to do sth.(一定要或不要作念某事)这类祈使句中频繁无谓 certain。如：

Be sure not to forget it. 千万别健忘啦。

Be sure to get there before nine. 务必在九点前到达。

Be sure to turn off the light when leave. 离开时一定要关灯。

四、两者在习语中的用法

1. 用于 for certain / for sure, 意为“确信地”“真正地”等，两者可互换。如：

I can't say for certain [sure] when he will come. 我不敢确信地说他什么时分来。

No one knows for sure [certain] what happened to her. 莫得东谈主真正地知谈她出了什么事。

2. 用于 make certain / make sure，意为“弄明晰”“弄得有把抓”，两者可互换。如：

They made certain [sure] (that) they weren't late. 他们有把抓不迟到。

I think there's a train at 10:40, but you'd better make certain [sure] of it. 我思10:40有趟火车开云体育，但你最佳去核实一下。