Question

he come in to my room while I write​

Answer 1

Answer:

while I was writing he came into my room

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Answer 2

Answer:

He came in to my room while I was writing.

Explanation:

while suggests that the the work associated with while is in continuation. Since the first clause is in past tense, past continuous tense should be used.

while also suggests that something has happened in-between some other work.