Forget that 90% figure (i.e. 90%+ of all the language provided by the teacher as input-provider should be in the target language)…How many messages are you providing? I did a quick search for Latin lessons:

Here’s the first Google hit for “Latin lesson” with 2 messages, the first recurring 3 different times. The second Google hit contains 0 messages. The third Google hit contains 1 message.

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