用來代替「前面已提過」的同類可數名詞。 複數用 ones: The blue jeans look cooler than the black ones. (這條藍色牛仔褲看起來比那條黑色的酷。) one / ones 和 it / they 的區別在於it(單數)/ they(複數)用來代替前面提過的「同一」名詞,如: My dad gave me a bike as a birthday present. I ride it to school every day. (我爸爸送我一部腳踏車當生日禮物。我每天騎它去上學。)