帮我改肯定句、否定句、一般疑问句：He ate two burgers a moment ago.She danced

He ate two burgers a moment ago。He didn't eat two burgers a moment ago。Did he eat two burgers a moment ago?She danced and sang the day day before yesterday。She didn't dance or sing the day day before yesterday。（ 注：否定句中的并列用OR)Did she danced and sing the day day before yesterday?I was a bad boy several years ago。I wasn't a bad boy several years ago。Were you a bad boy several years ago?They were very lovely in 2001。They weren't very lovely in 2001。Were they very lovely in 2001? 再问： She danced and sang the day day before yesterday。这句和下面两句怎么有两个day？ 再答： 应该是打错吧，正确的是 She danced and sang the day before yesterday。 She didn't dance or sing the day before yesterday。（ 注：否定句中的并列用OR) Did she danced and sing the day before yesterday? （注：he day before yesterday 是固定词组‘前天’， 不应该有两个day）