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Which one is the correct sentence to express about future

We will be reached there at 4 o clock morning. or

We will be reaching there at 4 o clock morning

What is the difference between will be + V3 and Will be + Ing

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Those are both incorrect. You can say "We will reach/arrive there at 4 o'clock in the morning".

"will be + past participle" is passive voice. E.g. "We will be met at the airport" (someone will meet us).

"will be + present participle" is for continuous actions (actions with a duration). E.g. "We will be waiting for you in the arrivals lounge".

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Students: We have free audio pronunciation exercises.
We will be reached there by 4 o clock morning.
We will be reached there at 4 o clock morning