1) What for are you going to the store?

2) Can you tell me what for you need my help?

3) I don't understand what for you are upset.

4) He questioned her on what for she wanted to keep it a secret.

5) Do you know what for she decided to quit her job?

6) What for did you bring all those books with you?

7) Can you explain to me what for you picked that color?

8) What for did you choose the most expensive option?

9) I can't figure out what for he keeps avoiding me.

10) What for should I apologize if I didn't do anything wrong?

11) Sure, here are some example sentences using the phrase "what for":

12) He shouted at his boss, demanding to know what for.

13) She couldn't understand what for he would propose such an outrageous idea.

14) The teacher asked the student to explain himself and justify what for he had disrupted the class.

15) The detective pondered what for the suspect would have committed the crime.

16) They argued for hours over what for they should prioritize in their project.