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Please correct me if it is wrong...,

"Do you know when our next class is starting ?"

                        or 

"Do you know when our next class starts?"

Thanks in Advance.

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Being very careful, I'd recommend

Do you know when our next class starts

because starting is not a process that takes place throughout an interval and so will seldom if ever strictly warrant a progressive tense.

In actual practice, however, very few people are that exact in their language, and you will hear both forms used by well educated native speakers interchangeably.

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  • Thanks Jeff...!
    – Prasanth
    Jun 14 '19 at 5:42

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