这句话正确吗?如果错误的话应该怎么纠正?

问题描述:

这句话正确吗?如果错误的话应该怎么纠正?
But last weekend,my mother saw him while we're go shoping

But last weekend,my mother saw him while we were shopping.
在这个句子里强调在那个时刻,要用进行时.因此while后要用进行时作从句.