One day a little girl was sitting and watching her mother do the dishes at the kitchen sink. She suddenly noticed that her mother had several strands of white hair sticking out in contrast to her brunette hair.
She looked at her mother and inquisitively asked, "Why are some of your hairs white, Mom?"
Her mother replied, "Well, every time that you do something wrong and make me cry or unhappy, one of my hairs turns white.
"Momma, how come ALL of grandma's hairs are white?"
▼Today's Expression
how come~ 基本的に"why"を置き換えることが出来ます。ニュアンスとしては少しくだけた感
の違いです。また、How comeの場合は語順が断定文と同じになるのでご注意を。 "Why are you late this morning?"よりも"How come you are late this morning?"の方が若い子が友達に聞いている感じの文になります。