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Is the word order in this sentence correct?

Could you let me know, in which language will the lesson take place.

Thank you in advance

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Here's some options:

Could you let me know in which language the lesson will take place? (This is somewhat formal. Some believe that it is improper to end a sentence with a preposition, which is false.)

Could you let me know which language the lesson will take place in? (This is more informal or natural.)

Comments  

Mountainhiker, thank you very much for your reply and for even 2 options Emotion: smile