"Sam used to live in England." is correct. "Sam IS used to live in England." is incorrect. IS is superfluous, meaning, it is not need and has no meaning. Examples: "John used to eat Chinese food." "Joe used to ski." "Amanda used to be a cheerleader."

1. Sam used (verb) + to live (infinitive) in England. Now he lives in Norway. a. I used to eat ice cream, but I have not eaten any ice cream since 2005. b. The United States used to be a colony of England, but it is now independent. c. Mr. and Mrs. X used to love each other, but now they plan to divorce. 2. Sam + is (verb) + used (adjective) + to (preposition) + livING (gerund) in England. So life in England does not surprise him. a. The neighbors are used to the noise. So when the jets fly noisily over their houses at night, they are not surprised. b. All my life I have gotten up at 3 a.m. every day. So I am used to starting my day so early. c. We here in Southern California are used to sunny weather every day. So when it is very cold or rains a lot, we get upset. Why? Because we are NOT used to cold or rainy weather!

The first sentance means Sam live in the Uk before he moved. the second sentance means he has lived in the UK for a while.

1. Sam USED TO live in England. (USED TO) Past tense. 2. Sam is USED TO livING in England. (IS USED TO) Habit acquisition. Hint: use a dictionary. the two expressions are there and very well explained.