如果你是想写一个回忆故事的话，建议用过去时啊。
1.I went to school.我去上学。
2.There was a person holding a knife。有个人拿着刀。
3.They were robbing a granny。他们在打劫老奶奶。
4.I called the police.我打给110.
5.The police seized the robbers.警察抓走了小偷。
6.The granny thanked me for my help.老奶奶感谢了我。
如果你是想写一个回忆故事的话，建议用过去时啊。
1.I went to school.我去上学。
2.There was a person holding a knife。有个人拿着刀。
3.They were robbing a granny。他们在打劫老奶奶。
4.I called the police.我打给110.
5.The police seized the robbers.警察抓走了小偷。
6.The granny thanked me for my help.老奶奶感谢了我。