absent-minded 是一個(gè)復(fù)合形容詞.形容詞的兩個(gè)基本用法：在名詞前面做定語(yǔ),比如：He is an absent-minded boy； 或者在系動(dòng)詞之后做表語(yǔ),比如：He is absent-minded.
專門(mén)注意它作表語(yǔ)的用法：【都有系動(dòng)詞be 或者 be 隨人稱變化的形式：is 等】
肯定：He is absent-minded
否定：He isn't absent-minded
在情態(tài)動(dòng)詞后：You mustn't be absent-minded
祈使句（也叫命令句）：Don't be so absent-minded