a) Grammar forms with the ending -ed:
- are divided into
- can be collected
- have formed
- have also presented
- may be used
- are translated
- are also included
b) Grammar forms with the ending -s:
- new interests
- can enjoy hobbies
- a hobby offers
- after periods
- four categories
- games and sports
- art forms
- many possibilities
- records and tapes
- concerts or operas
- painting offers
- all paints