this morning i went to the railway station buy a ticket for my mother.改错

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thismorningiwenttotherailwaystationbuyaticketformymother.改错thismorningiwenttotherailwaystationbuyati

this morning i went to the railway station buy a ticket for my mother.改错
this morning i went to the railway station buy a ticket for my mother.改错

this morning i went to the railway station buy a ticket for my mother.改错
做某事是to do sth
所以buy改成to buy

buy 改为 bought ,过去发生的事,用过去式