1. play（现在分词）                       
3. like（现在分词）                       
5. old（反义词）                         
7. book（复数）                       
9. father（对应词）                      

2. do（现在分词）                         
4. short（比较级）                     
6. box（复数）                              
8. glass（复数）                                                          
10. to（同音词）