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1、三只钢笔 2、六个苹果 3、12个篮球 4、32个西红柿 基数词：描述事物数量的多少的数词。 three pens six apples twelve basketballs thirty-two tomatoes Numbers 基数词 One Two Three Four Five Six Seven Eight Nine Ten Eleven Twelve Thirteen Fourteen Fifteen Sixteen Seventeen Eighteen Nineteen Twenty Twenty-one Twenty-two Thirty Forty Fifty Sixty Seventy Eighty Ninety A hundred 数词 序 顺序 表示事物的顺序的数词。 〔由基数词变为序数词〕 Learn these numbers and find out the rules: 一起找规律 1st first 2nd second 3rd third 4th fourth 5th 6th 7th 8th eighth 9th ninth 10th fifth sixth seventh tenth 11th eleventh 12th twelfth 13th 14th 15th 16th 17th 18th 19th 20th twentieth thirteenth fourteenth fifteenth sixteenth seventeenth eighteenth nineteenth 21st twenty-first 22nd twenty-second 23rd twenty-third 24th 25th 26th 27th 28th 29th 30th thirtieth 31st thirty-first twenty-f