Genesis 18:13

18:13 The Lord said to Abraham, “Why39 did Sarah laugh and say, ‘Will I really40 have a child when I am old?’

39	tn Heb “Why, this?” The demonstrative pronoun following the interrogative pronoun is enclitic, emphasizing the Lord’s amazement: “Why on earth did Sarah laugh?”
40	tn The Hebrew construction uses both הַאַף (ha’af) and אֻמְנָם (’umnam): “Indeed, truly, will I have a child?”