Sam used to take a walk after supper.
山姆过去常常在晚餐后散步。
Sam is used to taking a walk after supper.
山姆习惯于晚餐后散步。

Christine was kind to others all her life.
(含义：她已不在人间。)
Christine has been kind to others all her life.
(含义：她现在还活着。)
Mrs. Darby lived in Kentucky for seven years.
(含义：达比太太已不住在肯塔基州。)
Mrs. Darby has lived in Kentucky for seven years.
(含义：达比太太现在还住在肯塔基州，也有可能指刚离去。)

Which paragraph shall I read first?
我先读哪一段呢？
Will you be at home at 7:00 this evening?
今晚7点回家好吗？