We write: What are you doing?
We say: Whaddaya doing? /wʌ-də-yə-du-wɪŋ/
We write: What do you do?
We say: Whaddaya do? /wʌ-də-yə-duw/
The pattern is:
1) Written t at the end of the word “what” is pronounced as /d/.
2) Both do and are are reduced to /ə/.
So, both are pronounced /wʌ-də-yə/.
We hear the difference only in the main verb:
a simple form..or..an -ing form.
What are you reading?
What do you like to read?
Hey guys, what are you doing?
What do you like to do on a hot summer day?
What are you looking at?
What are you taking a picture of?
What do you usually do on weekends?
We have two pronunciation symbols for the sound: /ʌ/…/ə/
When the sound is stressed, we use this symbol: /ʌ/
When the sound is unstressed, we use this symbol: /ə/
The symbol for the unstressed sound is called a schwa: /ə/