When the Torah, in the parsha read yesterday in shul, writes the ten generations from Adam until Noach, it counts the years that each person lived. By all of them it says, “Vayihiyu,” except for Chanoch and Lemech. Why were these two written differently?Rav Chaim Kanievsky in Taama Dikra explains that the well-known Gemara in Megillah (10b) tells us that the word Vayehi is used when there is a painful event. A quick tally of the math shows that each one of the ten generations outlived their father, with the only exceptions being Chanoch and Lemech. That their fathers needed to bury their sons was a very painful event, despite the fact they were hundreds of years old! Therefore, their years were counted using the expression of pain, Vayehi. Says Rav Chaim, this is the message being conveyed: It’s always painful to bury a child, even if he is several hundred years old.