certainly
- adv.当然;肯定;无疑;确定;行
certain adj.有把握的 + -ly ...地
certainlyadv.
无疑；确定；肯定
without doubt
Without treatment, she will almost certainly die.
要是不治疗，她十有八九会死。
Certainly, the early years are crucial to a child's development.
毫无疑问，幼年对儿童的成长至关重要。
I'm certainly never going there again.
我肯定不会再去那里了。
当然；行
of course
‘May I see your passport, Mr Scott?’ ‘Certainly.’
“斯科特先生，请出示您的护照好吗？”“当然可以。”
‘Do you think all this money will change your life?’ ‘Certainly not.’
“你认为这些钱会改变你的生活吗？”“当然不会。”
You use surely , especially in BrE , to show that you are almost certain about what you are saying and you want other people to agree with you. 在否定句中，surely表示某事使人感到吃惊而不愿相信：
Surely this can’t be right?
这不可能是对的吧？
You’re surely not thinking of going, are you?
你不是想走吧？
Certainly usually means ‘without doubt’ or ‘definitely’, and is used to show that you strongly believe something or to emphasize that something is really true. 非正式的北美英语说法为：
I’ll certainly remember this trip!
我绝不会忘记这次旅行！
I’ll sure remember this trip!
我绝不会忘记这次旅行！
Compare 和
The meal was certainly too expensive (= there is no doubt about it) .
这顿饭的确太贵了（毫无疑问）。
The meal was surely too expensive? (= that is my opinion. Don’t you agree?)
这顿饭不是太贵了吗？（我这样认为，你不同意吗？）
In formal language only surely can be used to mean ‘without doubt’. 在正式用语中，surely才表示无疑：
This will surely end in disaster.
这无疑将以灾难告终。
certainly
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1
ADV-GRADED 当然;肯定
You use certainly to emphasize what you are saying when you are making a statement.The public is certainly getting tired of hearing about it...
关于此事，公众当然已经听腻了。
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2
ADV (表示同意)当然，行，没问题
You use certainly when you are agreeing with what someone has said.'In any case you remained friends.' — 'Certainly.'...
“无论如何，你们都是好朋友吧。”——“那当然。”
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3
ADV as reply 当然不
You say certainly not when you want to say 'no' in a strong way.'Perhaps it would be better if I withdrew altogether.' — 'Certainly not!'
“也许，我完全退出更好吧。”——“当然不是！”
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4
certainly可以用来强调所说内容属实：His death was certainly not an accident (他的死绝非意外)。surely 可用来表示反对或惊讶：Surely you care about what happens to her (不用说，你一定关心她的事吧)。美国人和英国人都用 certainly 表示同意请求和陈述：‘It is still a difficult world for women.’—‘Oh, certainly.’(“如今的世界对女性而言仍然很不容易。”——“嗯，那当然。”)注意，在这种情况下，美国人也用 surely: ‘Can I have a drink?’—‘Why, surely.’(“我能不能来杯饮料？”——“噢，没问题。”）
Y
adv
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1
- definitely or positively (`sure' is sometimes used informally for `surely')
- the results are surely encouraging
- she certainly is a hard worker
- it's going to be a good day for sure
- they are coming, for certain
- they thought he had been killed sure enough
- he'll win sure as shooting
- they sure smell good
- sure he'll come
- Synonym: surely sure for sure for certain sure enough sure as shooting
数据来源：WordNet
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I can certainly feel the effects of too many late nights .
我当然能感受到熬夜太多产生的影响。
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Beating the world champions is certainly a big ask for the team .
这个队要打败世界冠军当然难度很大。
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Certainly , the early years are crucial to a child 's development .
毫无疑问，幼年对儿童的成长至关重要。
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We 've certainly improved on last year 's figures .
我们的业绩的确超过了去年的数字。
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You 've certainly made an excellent job of the kitchen .
你们把厨房弄得好极了。
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Without treatment , she will almost certainly die .
要是不治疗，她十有八九会死。
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The news was certainly a weight off my mind .
这个消息真是去掉了我心里的重担。
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I 'm certainly never going there again .
我肯定不会再去那里了。
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He 's certainly got the right idea ─ retiring at 55 .
他真的想通了——打算在55岁时退休。
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The tax increases will certainly hit the poor .
增税肯定会加重穷人的负担。
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Since he left his wife he 's certainly gone down in my estimation .
他离弃妻子后我对他的看法便不如以前了。
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The team called ' The No-Hopers ' certainly lived up to its name .
叫做“无望者”的球队果真名副其实。
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The facts certainly fit your theory .
这些事实和你的说法丝毫不差。
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The students were certainly not wanting in enthusiasm .
学生们当然不乏热情。
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I shall certainly keep a beady eye on his behaviour .
我一定会时刻睁大眼睛提防他的行为。
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She certainly had me fooled ─ I really believed her !
她确实把我骗了——我真的相信了她的话！
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The story is almost certainly false .
这个故事几乎肯定是虚构的。
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He certainly knows his job .
他对自己的工作很在行。
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I 'll certainly remember this trip !
我绝不会忘记这次旅行！
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I certainly don 't have anything to prove ─ my record speaks for itself .
我当然不用证明什么——我的纪录就可说明一切。
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She certainly knows what 's what .
她当然知道轻重缓急。
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The meal was certainly too expensive .
这顿饭的确太贵了。
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Your remarks were certainly well timed .
你的话说得确实正是时候。
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' Certainly not , ' he replied emphatically .
“当然不。”他断然回答道。
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They 're not millionaires , but they 're certainly very comfortable .
他们不是百万富翁，但也很富裕。
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Her articles certainly don 't pull any punches .
她的文章确实一针见血。
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Dad 's certainly grown mellower with age .
随着年龄的增长，父亲当然是更老练了。
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She 's certainly brimful of energy .
她的确精力充沛。
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I know he 's had a hard time lately , but he 's certainly milking it for all it 's worth .
我知道他最近的日子不好过，但他却以此为借口为所欲为。
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The organization certainly prospered under his stewardship .
不可否认，这个组织在他的管理下兴旺了起来。
常用于加强语气，多用于口语中。
- Have you done it?
——你做完了吗？
- Absolutely.
——没错。
He was absolutely wrong.
他绝对错了。
强调毫无疑问。
He certainly did come to see me yesterday.
他昨天当然来看我了。
Certainly, he is a loser.
当然，他是个输家。
强调必然性，表示主观判断。
He will surely be punished.
他必定会受到惩罚。
They can surely overcome these difficulties as long as they have enough money.
只要有足够的资金他们肯定能克服这些困难。
同义词