They have gone to England,and they will go back next week.
（已經(jīng)去了某地方,還沒回來.）
They have been to Paris.
（曾經(jīng)去過某地方,強調(diào)去過）
They have been in England for two weeks.
（在某地方有呆過,強調(diào)“呆”的延長性）
They will go to England next week.
（強調(diào)要去哪個地方,瞬時性的）