误 He rose his hand to ask a question.

正 He raised his hand to ask a question.

误 The hostess raised to greet us.

正 The hostess rose to greet us.

析 raise和rise都可表示“由低向上升高的动作或趋势”,但raise是及物动词,在主动句中其后必须有宾语; rise是不及物动词,后面不直接跟宾语。

误 October 1,1949 saw the rising of the five-star red flag for the first time on Tian An Men Square.

正 October 1,1949 saw the raising of the five-star red flag for the first time on Tian An Men Square.

析 国旗是被升起的,不是自动上升的。因此, rising尽管形式不错,但意义不准确,应该用raising。

误 He studies hard to raise his English level.

正 He studies hard to improve his English.

析 raise his English level是逐字直译的汉式英语,“提高英语水平”可用 improve one's English表达。