1) wanna = want to = 想要，想做

　　I wanna go on vacation!

　　I don't wanna study!

　　You wanna call me back later?

　　2) gunna / gonna = going to = 会做

　　What's gunna happen!?

　　You're gunna freeze to death if you don't put a hat on!

　　Are you gunna go to Melissa's party?

　　3) coulda = could have = 会有

　　I coulda, but I didn't。

　　I thought I coulda gone to the concert. But I had to stay home and study。

　　Don't worry about what coulda been! Focus on the future!

　　4) woulda ＝ would have ＝ 将会

　　I woulda, but I didn't。

　　I woulda said yes to going on a date with Bob, but my parents woulda killed me! They think I need to focus on my studies。

　　5) shoulda ＝ should have = 应会，该有

　　I shoulda, but I didn't。

　　I shoulda said "yes!" I wanna go on a date with Bob!