Question

he said to us,"let me see what it is."(change the mode of narration)

Answer 1

we were told by him that he would see what that was.

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Answer 2

We were told that he would see what exactly that was.

The change of narration would be from simple present to past tense by making minor changes.

In addition, this can also be from changing direct speech to an indirect speed or present continuous tense to past continuous tense.

Basically, this sentence is in direct speech that he told directly.

The indirect speech would be changing the tense.