单句改错。 1. I don't know if to help him or not. ________2. She can't help cleaning the house because she's busy a cake. ________3. We all hope you to make rapid progress. ________4. The results of the research are to publish soon. ________5. It is too heavy for me to lift it. ________6. It's awfully good for you to come and meet us. ________7. These are very good books for your children to be read. ________8. He did what he could help me with my physics. ________9. Let's find a big bag to put the things. ________10. It would be easier to climb over the mountain than going round the valley. ________