Viết lại câu sao cho nghĩa không đổi

1.    It is difficult  to learn Japanese
2.    We are delighted to get your letter yesterday
3.    It is not easy to answer these question
4.    Your writting is difficult to read
5.    I am surprised to see Tom in the party last night
6.    It is impossible to understand his theory
7.    They are ready to start now
8.    It is interresting to see that film
9.    I am eager to participate in the Y&Y Club
10.    She is afraid to go out alone at night