should not be
should的否定形式是shouldn't,意為不應該,後一般接should(shouldn't)do sth,must的否定是mustn't.但語氣強烈,表禁止,need的否定是needn't。和常規變法是一樣的,shouldn't是很常見的,這些情態動詞多多練習就沒什麼問題的。希望能幫到你!
祝你更上一層樓,有不懂的可以再問哦