I think it's nadar because "va al mar" means he is going to the sea. Therefore, he would be going to swim.
1. How is the teacher? She is a young woman from Paraguay./ una mujer joven es de Paraguay
2.is Alberto a good student? Why? He is a very good student that is organized and likes to study./ es un estudiante bueno por que es muy organizado y le gusta estudiar.
3. What is andres like? He does not like to do homework but is very artistic/ a el no le gusta la tarea, pero es not artístico.
4. What is Felipe like? Very unorganized but good to get along with./ el es muy desorganizado pero es muy simpático.