Tìm lỗi sai và sửa lại: a) A friend of mine phoned to invited me to a party. b) The party was a celebrate of their 25th wedding anniversary

Tìm lỗi sai của câu, và sửa lỗi, giải thích vì sao ạ?
a) A friend of mine phoned to invited me to a party
b) The party was a celebrate of their 25th wedding anniversary