Key phrases and expressions:
1.你的旅行如何? How was your trip?
2.发生take place
3.曾去过..... (去而复返) have/has been to
4.太....以至于.....SO ... that
5.到...去了( 去而未归). have/has gone to
6. 上课铃响了。
There goes the bell.
That's the bell.
The bellis ringing.

Michael: Hi, Maria, long time no see. Where_ have you_ been _?
Maria: I have been to Cuba to be a volunteer.
Michael: Really? It must be fun.
Maria: Yeah, I enjoyed the work. Do you know where Jane has been for her summer holiday?
Michael: She_ has been to Mount Huang for vacation.
Maria: Have you seen her this morning?
Michael: Oh, she. has gone to the library.
Maria: I will go and find her. By the way, where is Kangkang?
Michael: He_ has gone to the library, too. Let's go and find them.