1 ADV-GRADED 当然;肯定 You use certainly to emphasize what you are saying when you are making a statement. 当然;肯定 [emphasis]
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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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The bombs are almost certainly part of a much bigger conspiracy.
几乎可以肯定，这些炸弹是一个更大的阴谋的一部分。
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Today's inflation figure is certainly too high.
今天的通胀率确实太高了。
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Certainly, pets can help children develop friendship skills.
宠物的确能够帮助孩子们培养交友技能。
2 ADV (表示同意)当然，行，没问题 You use certainly when you are agreeing with what someone has said. (表示同意)当然，行，没问题
3 ADV as reply 当然不 You say certainly not when you want to say 'no' in a strong way. 当然不 [emphasis]
Usage Note :
You use certainly to emphasize that what you say is definitely true. His death was certainly not an accident. You use surely to express disagreement or surprise. Surely you care about what happens to her. Both British and American speakers use certainly to agree with requests and statements. 'It is still a difficult world for women.' —'Oh, certainly.' Note that American speakers also use surely in this way. 'Can I have a drink?' —'Why, surely.'
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。”）
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