Question

the teacher said to me,"what are you doing" change to indirect speech

Answer 1

Heya
Here is your answer
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The teacher asked me what I was doing

In interrogative sentences said is changed to asked
to is removed from reporting verb
question word is kept as it is 
1st form of verb is changed to 2nd
persons are changed according to SON
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Hope this helps! ^_^

Answer 2

Hi,

Here is your answer,

The teacher asked me what I was doing.


Hope it helps you !