1)
וירד מצרימה -
Why did Yaakov and his children have to descend to Egypt in order to become a great nation? Why couldn't our nation develop in the Land of Canaan?
2)
אנוס על פי הדבור -
How do we know that Yaakov did not descend willingly to Egypt? He had just been told (Bereishis 45:26-28) that his long-lost son Yosef was there!