Answer:
You did not include the conversation
With adding a “s” at the end, for example with the word “sierra” if I wanted to make it plural I would just add a “s” at the end and it makes it “sierras” which is plural and also another is like with “carro” if I want to turn it into plural I’ll just simply add the “s” at the end and now it’s “carros”.
19.- saben
20.- conoce
21.- sabe
22.- sabe
23.- sabemos
24.- sabe
25.- se
26.- conozco
27.- conoce
28.- saben
29.- sabemos
30.- se