改错题 Tom wasn't bought (300) envelopes from the post office yesterday.否定句：一般疑问句：划线提问：Sorry!
问题描述：
改错题 Tom wasn't bought (300) envelopes from the post office yesterday.否定句：一般疑问句：
划线提问：
Sorry!
答
wasn't bought 改为 didin't buy
否定句：
Tom didn't buy 300 envelopes from the post office yesterday.
一般疑问句：
Didn't Tom buy 300 envelopes from the post office yesterday?
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答
Tom didn't buy 300 envelops from the post office yesterday.
Did Tom buy 300 envelops from the post office yesterday?
答
was not bought