Look at the first of these four pictures. This is Harry. He is sitting at a table. He has a pen in his hand. There is a sheet of paper on the table in front of him. There is a bottle of ink on the table, too.
What can you do if you have ink, paper and a pen? You can write. Harry has ink, paper and pen, so he can write. Harry is going to write a letter.
Look at the second picture. What is Harry doing now? He is writing the letter