帮我看下我的英语作文

Today,I saw a computer in the supermaket and it caught my fancy.
It cost five thousand RMB,so I thought it's too expensive for me,but I liked it very much and I decided to buy it on instalments.
The shop assistant told me I could pay a deposit of one thousand and five hundred RMB a month for eight month.
I promised and I took the new computer back home with me in the end.

Today,I saw(应该是see，因为你前面说today，要用一般现在时） a computer in the supermaket and it caught （catch)my fancy.
It costs five shousand RMB,I thought it's too expensive for me,but I liked it too much and I decided to buy(bought这里要用过去式么) (不用）it on instalments.
The shop assistant told （tells）me I could paid a deposit of one shousand and five hundred RMB a month for eight month.
I promised and I took the new computer go home with me in the end.
应把过去式改为现在的时态