be surprised是動詞+形容詞結構，在句中作謂語，意為“感到吃驚的”。be surprised at 意為“對...感到吃驚”
She was surprised.
她感到吃驚。
Everybody was surprised at you .
大家都對你感到吃驚。
in surprise是介詞+名詞結構，意為“吃驚的”
John turned round and looked at him in surprise.
約翰轉過身去，吃驚的看著他。
05.07 be surprised和in surprise區別
王鏽才