how can i know when to use the subjunctive or the indicative with Lo/la + noun + es que+ subjuntivo / indicativo for example la idea /cuestion/cosa
You have to memorize the expressions of certainty (which would use the indicative). There is probably a list of these in an earlier lesson on the subjunctive.
Sign in to submit your answer
Don't have an account yet? Join today
Test your Spanish to the CEFR standard