Ne vs neyi?
When do I use ne and when do I use neyi

Question

Answer

I'm learning and battling with this as well. Is not ''neyi'' the accusative form (direct object form) of ''ne''?

Answer

Neyi is the accusative form of the word Ne

some examples;
- Neyi beğenmedin? What haven't you liked?
 - Bu arabayı beğenmedim. I did not like this car.

***There are some verbs that requires to add accusative suffix ı/i to the objects in the sentence. And beğenmek is one of them. And there are some verbs that is okay to use with or without this suffix- when you use it works like "the" in English, when you don't add, it means the object is not certain.

Çocuğu gördüm. I saw the kid.
(Bir) Çocuk gördüm. I saw a kid. ---> either you say bir or not the sentence means the same.

http://blog.learnturkisheasy.com/2012/10/neden-why-neneyi-what.html

Answer

NE:

She picked flower for her mum. ( O, annesi için çiçek topladı.) Ne topladı? Çiçek.(Flower's mission in Turkish grammar no symptom object)

NEYİ:

She gave flowers to her mum. ( O, çiçekleri annesine verdi.) Neyi verdi? Çiçekleri.
(Flowers's mission in Turkish grammar symptom object)

Answer

actually same things :) 
but neyi is more specific ....

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