Explanation:
ser is like identity
ser for time
estar is like location
20 son
21 sois (you all are...vosotros)
22 estamos
23 es
24 son
25 estan
26 son
27 es
28 estan
29 eres
30 es
31 es
32 es
33 son
34 soy
35 estan
36 estan
37 son
38 es
39 son
40 son
Ella condujo fuera de la carretera para evitar un ciervo.
Answer: It looks like you just need to cut off the last vowel (and consonant if there is one) of the word.
For number one, it's "perezosísimo"
For question 2, it's "aburridísimo"
For question 3, I think you do the same but keep it plural, so "interesantísimos" I would imagine.