That would be the first one Nadan which means to swim
Have a good day
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
