有關英文時態既問題想問下

I went to ABC Department Store in ABC City to buy electronic products last Wednesday. I took a taxi to the department store. I arrived at the department store at 10:30am. The department store was composed of two tall buildings. There are many people in the department store. I went to Electronic Product Section. There were different kinds of electronic products in the section. I chose three electronic products. I paid $300 for them. I left the department store at 11:15am.

我係上個星期三之前已去過ABC Department Store 買電子產品。問問大家以上篇文句子既時態有無錯。另外宜家間Department Store 都係由兩座高樓所組成，The department store was composed of two tall buildings lee 句用過去式岩唔岩。