posted by peter .
what does these sentence say
1. Rufo/llegar temprano a la clase de matematicas
2. Nico y Gilda/ usar la computadora en la clase de historia
Rufo/to arrive early to math class. That is what it will say when you conjugate the infinitive "llegar" to agree with Rufo.
Nico and Gilda/to use the computer in History class.
Again, you need to conjugate the infinitive "usar" to agree with both Nico and Gilda.