It's my fiftieth birthday. -
My parents bought the second flat. -
She travels alone for the second time. -
"O" is the fifteenth letter of the alphabet. -
Is "T" the twentieth letter of the alphabet? -
He watched the first film. -
He bought the sixty-sixth shirt. -
Is Saturday the sixth day of the week? -
Mark is his fourth son. -
This is not the thirtieth floor. -
This is the thirty-first floor. -
This is the fiftieth floor. -
My birthday is on the nineteenth of January. -
He travels alone for the first time. -
They come back on the second of August. -
This king lived in the twelfth century. -
I give you the third chance. -
He cooks this cake for the ninth time. -
This is our ninth dancing class. -
I wrote my sixth song. -