巧克力chocolate既是可数名词也是不可数名词，具体分情况而定：表示颜色、味道，单指巧克力时是不可数，用chocolate；一盒、一包巧克力糖，指一块一块的糖时，是可数名词，用chocolates。
chocolate的例句
You'll get fat if you eat so much chocolate.
你如果吃这么多巧克力就会发胖的。
He'd eat chocolate all day long if I let him.
我要是不拦着，他会整天不停地吃巧克力。
He broke the bar of chocolate in two and gave me half.
他把巧克力掰成两半，给了我一块。
When I was young chocolate was a treat.
我年轻的时候，吃巧克力是一种难得的享受。
He broke the chocolate in two.
他把那块巧克力一分为二。