Use the words in brackets to complete the sentences . The Present Perfect , the Present Simple the Present Continuous?

1 . I am busy now. I am doing my homework. 2. I can help you. I am free now. I have done my homework. 3. Look! Little Johnny is washing his bike. He is funny, isn\'t he? 4. Little Johnny has washed his bike . Now the bike is clean. 5. I am learning the new words now. 6. I have learnt the words and I can go with you. 7. I have read the story. I think I can answer your questions about it. 8. I am reading the story now. We can discuss it later. 9. Mary is busy. She is buying a present for her sister. 10. She has bought a present for her sister. She can go to the bookshop now.