1. bed (复数)                                     
2. careful (副词)                                
3. speak (过去式)                              
4. see (过去分词)                              
5. run (现在分词)                              
6. seven (序数词)                              
7. new (反义词)                                
8. I (反身代词)                                  
9. interesting (最高级)                        
10. long (比较级)