Question

My uncle is --------(arrive) from delhi next weak.

Answer 1

hello here is ur answer
MY UNCLE IS ARRIVING FROM DELHI NEXT WEEK.

this is a present continuous tense so we use ing form of the verb

Answer 2

Pikaa ^^
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Here is your answer:

My uncle is arriving from delhi next week

Here arriving is used because there is a helping verb is which indicates it to be a present continuous sentence and we always use V-1 + ing with present continuous
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Pikaa ^^