I thought that any statement after 'cuando' should be in the subjunctive tense if it implied anything other than habitual events or was used in a question, but wasn't sure if this is actually the case.

E.g.

• ¿Cuándo vas a la playa? (No need to use subj. as this is a question)

• Cuando vamos a la playa, normalmente... (No need to use subj. as this is talking about something habitual)

• Cuando vayamos a la playa... (Need to use subj. as this implies
  uncertainty)

Can someone check that I have the correct understanding of the above sentences?