My cousin and I were decided to go to Beijing in our car for weekend这句话哪错了

My cousin and I were decided to go to Beijing in our car for weekend这句话哪错了

题目
My cousin and I were decided to go to Beijing in our car for weekend这句话哪错了
这句话哪错了,正确的应该是什么呢?
答案
for改成at
在周末用at weekend不能用for
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