Certainly 对比 Definitely 对比 Of course 对比 Surely 对比 Undoubtedly

在英语中何时使用每一个，包含含义、语域和例句。

Certainly

前 1000（非常常见） A2 adverb

Definitely

前 1000（非常常见） A2 adverb

Of course

前 1000（非常常见）

Surely

前 2000（常见） B1 adverb

Undoubtedly

正式 前 5000（相当常见） C1 adverb

最正式: Undoubtedly

	Certainly	Definitely	Of course	Surely	Undoubtedly
发音	🇬🇧 /["/ˈsɜːtnli/"]/ 🇺🇸 /["/ˈsɜːrtnli/"]/	🇬🇧 /["/ˈdefɪnətli/"]/ 🇺🇸 /["/ˈdefɪnətli/"]/	🇬🇧 //əv kɔːs// 🇺🇸 //əv kɔrs//	🇬🇧 /["/ˈʃʊəli//ˈʃɔːli/"]/ 🇺🇸 /["/ˈʃʊrli/"]/	🇬🇧 //ʌnˈdaʊtɪdli// 🇺🇸 //ʌnˈdaʊtədli//
含义	肯定；一定。 Definitely; for sure.	当然，毫无疑问 For sure, without a doubt	肯定，很明显。 Definitely, it's obvious.	肯定；毫无疑问 certainly; without a doubt	肯定；毫无疑问。 Definitely; without a doubt.
例句	Without treatment, she will **almost certainly** die.	I definitely remember sending the letter.	Are you joining us for dinner tonight? Of course!	Surely we should do something about it?	She is undoubtedly the best candidate for the position.
语域	中性	中性	中性	中性	正式
常见程度	前 1000（非常常见）	前 1000（非常常见）	前 1000（非常常见）	前 2000（常见）	前 5000（相当常见）
CEFR 等级	A2	A2	-	B1	C1
词性	adverb	adverb		adverb	adverb
搭配	certainly agree, certainly possible, certainly not, certainly true, certainly yes	definitely agree, definitely believe, definitely know	of course not, of course yes, of course you can, of course it is	surely believe, surely know, surely must	undoubtedly true, undoubtedly clear, undoubtedly helpful
反义	uncertainly, doubtfully	doubtfully, uncertainly	-	doubtfully, unsure	doubtfully, questionably, uncertainly
常见错误	'Certainly' is often incorrectly used in place of 'certain' in adjectives., Learners might confuse 'certainly' with 'definitely' without noticing the subtle nuance., Some learners use 'certainly' in inappropriate contexts, such as casual greetings.	Often confused with 'defiantly' which means resisting authority., Sometimes spelled incorrectly as 'definately'.	Using it in formal writing where a different expression is needed., Confusing it with other affirmations like 'certainly' or 'definitely'.	Confusing 'surely' with 'sure' — 'sure' can be an adjective., Using 'surely' as a response when a simple 'yes' would suffice., Omitting 'surely' in a sentence where it clarifies certainty.	Confused with 'undoubtably', which is incorrect., Omitting it when certainty is implied., Using it in informal contexts where 'definitely' is more suitable.
用法说明	当你想强调肯定或同意时可以使用‘当然’。它比‘好’更正式，适合在专业场合使用，但在随意的对话中可能显得太强烈。 Use 'certainly' when you want to emphasize affirmation or agreement. It is more formal than 'sure' and works well in professional settings, but might feel too strong in casual conversations.	使用'肯定'来强调确定性。它在口语和书面英语中都很合适。避免在过于正式的场合使用，像'当然'这样的替代词可能更合适。 Use 'definitely' to emphasize certainty. It fits well in both spoken and written English. Avoid using it in overly formal contexts where alternatives like 'certainly' might be more suitable.	在非正式和正式场合都可用，用来肯定显而易见的事情。避免在非常正式的书面语中使用。 Used in informal and formal situations to affirm something obvious. Avoid in highly formal writing.	使用'当然'来表达确定性。它适用于口语和书面语，但在正式讨论中更常见。在非常随意的对话中，避免使用它，简单的词如'绝对'可能更合适。 Use 'surely' to express certainty. It’s appropriate in both spoken and written contexts but is more common in formal discussions. Avoid using it in very casual conversations where simpler words like 'definitely' might fit better.	用于强调确定性或强烈信念；通常在正式写作或演讲中使用，在日常对话中不常见。 Used to emphasize certainty or strong belief; typically in formal writing or speeches, not common in casual conversation.

在真实片段中看它

Breaking Bad › S1 E4

Certainly a second opinion, right?

Breaking Bad › S1 E1

and I certainly don't feel that we owe any late...

Breaking Bad › S1 E3

certainly not as far as I know.

Breaking Bad › S1 E4

Certainly a second opinion, right?

Breaking Bad › S1 E1

and I certainly don't feel that we owe any late...

Certainly

Sherlock › S1 E1

Definitely. The gun.

Breaking Bad › S1 E3

Oh, God. See that? Pipe, definitely.

Better Call Saul › S1 E1

- He's definitely a stickler. - Yeah. Yeah.

Sherlock › S1 E1

Definitely. The gun.

Breaking Bad › S1 E3

Oh, God. See that? Pipe, definitely.

Definitely

Of course.

Agatha Christies Poirot › S1 E1

You know her, of course.

And, of course, I paid my respect to Bubba himself.

Of course.

Agatha Christies Poirot › S1 E1

You know her, of course.

Of course

Yes, sir, they surely did.

Surely

常见问题：Certainly 对比 Definitely 对比 Of course 对比 Surely 对比 Undoubtedly

Certainly、Definitely、Of course、Surely和Undoubtedly 有什么区别？

Certainly: Definitely; for sure. Definitely: For sure, without a doubt Of course: Definitely, it's obvious. Surely: certainly; without a doubt Undoubtedly: Definitely; without a doubt.

哪个更正式：Certainly、Definitely、Of course、Surely和Undoubtedly？

Undoubtedly 是其中最正式的。

哪个更高级：Certainly、Definitely、Of course、Surely和Undoubtedly？

Undoubtedly 级别最高，在 CEFR 量表上为 C1。

能各给一个例子吗？

Certainly: Without treatment, she will **almost certainly** die. Definitely: I definitely remember sending the letter. Of course: Are you joining us for dinner tonight? Of course! Surely: Surely we should do something about it? Undoubtedly: She is undoubtedly the best candidate for the position.

我可以互换使用 Certainly、Definitely、Of course、Surely和Undoubtedly 吗？

不总是。Certainly、Definitely、Of course、Surely和Undoubtedly 相关，有时可以互换，但在语域、常见程度和用法上不同，所以换用可能改变意思或语气。替换前先看看上面的区别。