2 teenage girls at school?

Two teenage girls at school,1at a posh school,the other at a comprehensive.Teacher asks the posh1 `give me a sentance using the word IMPROPER` she replys with her posh accent `at the weekend my father was digging up potatoes using a spade that was improper., he should have used a fork`. Teacher asks the same question to the other girl she replys` Last night my boyfriend was shagging me and when his bollox was slapping against my a*se i new he was inproper:)