OK these work best if you have somebody, who already speaks English, to practice with.
NOTE: They are not all alliterations but all use the same sounds, well nearly all :)
A: Apples, Apricots and Artichokes are all available at Angie's.
B: Boris bounces balls behind the bins.
C: Cotton cutters can't count quickly.
D: Donkeys don't dare dance downstairs.
E: Eighty eight elephants eat eagle's eggs every Easter.
F: Forty four flying fish fight for food.
G: Gobbling green grass gives geese gas.
H: Hippos hate hungry hobgoblins who howl.
I: Indians in Israel invent indigestable icing.
J: Janet joined John jumping Jackie's jumper.
I'll put more up if people want them.