Por ahora los alumnos están en su clase.
Voy a empezar las clases..... is how you say i will begin class in spanish
It means "How many students are there in the Spanish class?"
'Clase de tenis' is tennis class in Spanish.
You say, "Hola estudiantes"
You would say "Tus estudiantes".
Clase.
The question is asking: How many students are there in the spanish class? So lets say there are 15 students in the class, you would reply with: There are 15 students in the spanish class. "Hay quince estudiantes en la clase de español." You can replace quince with any number.
Buenos estudiantes.
to say how well you are doing in a class (example below): i am doing good in my spanish class - hago bueno en mi clase española
En el salón hay (The class where I am)
la clase
Tu clase