should not have + 過去分詞

• You should not have wasted time asking her out. (你不該浪費時間約她出去) (正)
• You should have not wasted time asking her out. (誤)

解說：should have + 過去分詞，肯定式表示過去本應做某事但實際上並沒有做，而否定式表示過去不該做某事但卻做了。否定詞 not 應放在第一個助動詞之後。