
3.Hey,either you stop criticizing my cooking or I start practicing on your head.
喂,你再對我的廚藝挑三揀四,別怪我對你不客氣.
Let me practice on your head 我要給你點顏色看看;我要教訓教訓你(威脅)
4.Don't mess with my papers. If you do,I'll lose something. 別動我的論文,不然我會丟東西的.
mess with sth. 把......搞砸,把......弄得一塌糊涂