I didn't expect him to become a successful writer.

I didn't expect him to become a successful writer. 

 나는 그가 성공적인 작가가 되리라고는 예상하지 못했다. 

[영어식 어순 익히기]  

I didn't expect him / to become a successful writer.

나는 그가 ~할 거라고 예상하지 못했다(않았다) / 성공적인 작가가 될거라고