Listen to American people speak, like in movies or television. You will catch on to the accent. If you are good at writing English, practice speaking what you write or read- reading English out loud will help you.

听英文歌也是不错的，我反而认为看英国电影比较好，美国人讲英文太快了，很辛苦才抓到他们讲什么。－＿－＂ 找人用英文聊天也是个好办法！