作业帮What did he do just now?改否定句 She was reading books then.改否定疑问句
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What did he do just now?改否定句 She was reading books then.改否定疑问句
What did he do just now?改否定句 She was reading books then.改否定疑问句
What did he do just now?改否定句 She was reading books then.改否定疑问句
改否定句：What did he not do just now?
第二句一般疑问句：Was she reading books then?特殊疑问句：有好多种改法：如1,What was she doing then?2,Who was reading books then?3,Which books was she reading then?4,Where was she reading books then?.
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What didn't he do just now
Didn't she is reading books then
what didn't he do just now?she wasn't reading books then
what did he do just now------what didn't he do just now
讲变否定句的规则是：1可以加否定副词，例如 never，seldom 等。 2当然是要加not 了，可是not 不是随便加的，若句子谓语是系动词（be的各种变形），情态动词（will，can 等），要是没有他们只有普通动词那就只能根据时态用do的各种形式再加上not了...
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what did he do just now------what didn't he do just now
讲变否定句的规则是：1可以加否定副词，例如 never，seldom 等。 2当然是要加not 了，可是not 不是随便加的，若句子谓语是系动词（be的各种变形），情态动词（will，can 等），要是没有他们只有普通动词那就只能根据时态用do的各种形式再加上not了。这个句子出现了DID这个助动词，所以便否定not 放在它后面就行了。
she was reading books then---wasn' she reading books then?
讲不要觉得否定疑问句就复杂了，根据它 的名字线变成否定句再变成疑问句。所以先把not 放在系动词后（刚讲过的哦），变成了she wasn't reading books then;咱们再把它变成疑问句。只要把谓语提前就好了，由于谓语是系动词直接把它提前就好了；顺便说一嘴，要是句子是普通动词，把助动词提前就好了。
【注】，，回头看一下整理一下否定句和疑问句的变法会有帮助的哦
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