certainly的同义词：absolutely surely。释义：肯定的。
辨析：
1、absolutely adv. 绝对地，当然
〔辨析〕
常用于加强语气，多用于口语中。
〔例证〕
- Have you done it?
——你做完了吗？
- Absolutely.
——没错。
He was absolutely wrong.
他绝对错了。
2、certainly adv. 无疑，确定；当然
〔辨析〕
强调毫无疑问。
〔例证〕
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。
3、surely adv. [正式]必定，无疑
〔辨析〕
强调必然性，表示主观判断。
〔例证〕
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。
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