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you should see a dentist when you have a toothache .变特殊疑问句

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you should see a dentist when you have a toothache .变特殊疑问句
这得看划线部分
see a dentist 应为 what should you do when you have a toothache
when you have a toothache 应为 when should you see a dentist
再问: you should better take a good rest if you have a cold.变否定句呢?
再答: You should better not .......
再问: you should ( ) better take a good rest if you have a cold
再答: 这个句子很少见,一般用had better 那只能用shouldn't .
再问: you had ( ) better take a good rest if you have a cold.变否定句