分类：教育/科学-外语学习-英语翻译
问题：用theyusedtokeeppets.否定，疑问各造两句话，翻? 
用they us to keep pets. 否定，疑问各造两句话，翻译
回答：否定句
they used not to keep pets
they used to keep no pet
疑问句
一般疑问句did they use to keep pets
特殊疑问句what did they use to keep