確定性副詞

確定性副詞會透露講話者對某件事的確信度。確定性副詞會出現在主要動詞前，但如果主要動詞是 Be 動詞時則放在後面。這類副詞有 certainly、definitely、probably、undoubtedly、surely 等。

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He definitely left the house this morning. He surely won't forget. He is probably in the park. He is certainly a smart man.

如果有助動詞，確定性副詞就會放在助動詞和主要動詞之間。

He has certainly forgotten the meeting. He will probably remember tomorrow. He is definitely running late.

有時這類副詞也可以放在句首。

Undoubtedly , Winston Churchill was a great politician. Certainly , I will be there. Probably , he has forgotten the meeting.

當確定性副詞 surely 放在句首，就表示講話者認定某件事是真實的，但期望得到確認。

Surely you've got a bicycle. Surely you're not going to wear that to the party.