'In' if it's a school context. Within a school, we talk about being 'in' one lesson or another.
'At' is possible if you go to a gym in your free time and attend lessons there.
PS Why the name change? Tired of being 'Helen'?
30 oktober 2018
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Heb je je antwoorden nog steeds niet gevonden?
Schrijf je vragen op en laat de moedertaalsprekers je helpen!