Sequence of tenses One of my students wrote: While you are walking throughout the museum, the guide expound the history of the town since a few centuries ago up to now

English as a Second Language English Vocabulary, Grammar and Idioms
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Hi again!

One of my students wrote: While you are walking throughout the museum, the guide expound the history of the town since a few centuries ago up to now.
How can I correct this ?
Can you give me a clue?

Thank you!

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While you walk through the museum, the guide will expound on the recent history of the town.

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