31 32 33 34 35 36 37 38 39 40用英语怎么写

31-39thirty(30) + (1one,2two,3three,4four,5five,6six,7seven,8eight,9nine) 3(1,2,3,4,5,6,7,8,9)31 就是 thirty one,32 就是 thirty two 。39 就是 thirty nine40-forty