Adverbials of probability
可能性狀語

We use adverbials of probability to show how certain we are about something. The most frequent adverbials of probability are:
我們用可能性狀語表示我們隊對某件事的確定程度。最常用的可能性狀語有：

certainly - definitely - maybe - possibly

clearly - obviously - perhaps - probably

maybe and perhaps usually come at the beginning of the clause:
maybe 和perhaps 通常在句首出現(xiàn)：

Perhaps the weather will be fine.

Maybe it won’t rain.

Other adverbs of possibility usually come in front of the main verb:
其他可能性副詞經(jīng)常出現(xiàn)在主要動詞的前面：

He is certainly coming to the party.

Will they definitely be there?

We will possibly come to England next year.

but in after am, is, are, was, were:
但是可能性狀語要在be動詞后面:

They are definitely at home.

She was obviously very surprised.?