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前面部分的 Last week I went to the theatre.I had a very good seat.The play was very interesting.I did not enjoy it. 用于介紹背景，所以用了一般過(guò)去時(shí)。　　

A young man and a young woman were sitting behind me.They were talking loudly. 用于描述當(dāng)時(shí)的情況，由于當(dāng)時(shí)動(dòng)作正在進(jìn)行，故了過(guò)去進(jìn)行時(shí)。當(dāng)然，此處用一般過(guò)去時(shí)也不能算錯(cuò)，但“效果”肯定不如用過(guò)去進(jìn)行時(shí)好。仔細(xì)體會(huì)一下吧。