What is the use of 的是? I have this sentence: "我觉得奇怪的是", which translates to "I feel weird". But wouldn't "我觉得奇怪" suffice? 

What is "的是" supposed to do in this sentence? From my research, the best conclusion I came up with was that it turns "奇怪" into a noun and therefore makes the sentence follow the subject + verb + object paradigm.



EDIT

My bad for not posting the complete sentence


  我想学习普通话，因为我觉得奇怪的是，即使我是中国人，但当我去中国旅行时，我却无法与人沟通。


"I wanted to learn Mandarin because I find it odd that I cannot communicate with people when I travel to China even though I'm Chinese."

I thought since it was sectioned with the commas it would have been fine and could act on its own.

It should also be noted this was extracted from a conversation, so I don't know if this would be officially grammatically correct or not. With this new info in mind, does the sentence sound right in a conversation, and, again, what is "的是" doing?
的 (refer to definition 2 in this dictionary)


  
  代替所指的人或物：唱歌～。
  


我觉得奇怪的 here refers to things I feel weird. 

So, 我觉得奇怪的是 could be interpreted as "things I feel weird are:" or "What I feel weird are:".