问题描述：
将下列英语句子转换成否定句和疑问句
1.the students had a terrible school trip
2.they saw an octopus in the Visitor's Center
3.they took the subway back to school
4.the students watched a movie about dolphins
5.the science teacher cleaned the bus
1.the students had a terrible school trip
2.they saw an octopus in the Visitor's Center
3.they took the subway back to school
4.the students watched a movie about dolphins
5.the science teacher cleaned the bus
问题解答：
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