动量补语"次"

"数词＋次"放在动词（或者"动词＋过/了"）后面，说明动作做了几次。宾语是一般的东西时，"几次"放在宾语前面：看过两次电影。宾语是人称代词时，"几次"放在宾语后面：见过他一次。宾语是地方时，两种都可以：去过两次北京／去过北京两次。

To say how many times something happens, put number + 次 after the verb (and after 过 or 了 if there is one): 去过两次 "have been twice". Where does the object go? With an ordinary object, the count comes first: 看过两次电影 "have seen two movies / gone to the movies twice". With a pronoun, the count comes after it: 见过他一次 "have met him once". With a place name, both orders are fine: 去过两次北京 or 去过北京两次. To ask, use 几次: 你去过几次? "How many times have you been?"