Learn Spanish (Latin America): Los estudiantes siguen aprendiendo el idioma.

To say someone "keeps doing" or "continues doing" an action, Spanish uses the verb seguir followed by the gerund (the "-ing" form). Here, siguen means "they keep" and aprendiendo means "learning".

Why is it siguen and not "seguen"?

The verb seguir has an "e-to-i" stem change in the present tense. This means the e in the root of the verb changes to an i for most forms, including the "they" form, giving us siguen.

Why is it el idioma? Doesn't the "a" at the end make it feminine?

Normally, yes! However, idioma is one of several common Spanish words ending in "-ma" that are actually masculine. Other examples you might already know include el problema, el sistema, and el clima.

Could I use the verb continuar to say they "continue learning"?

Yes, you could say continúan aprendiendo. Both seguir and continuar work exactly the same way when combined with a gerund, but seguir is much more common in everyday spoken Spanish.