Are these correct and common sentences?
Are these correct and common sentences? Change this into a more natural, friendly sentence.

1. If there is another chance to meet you Eva, then I would like to have a chance to answer this question.
만약 에바 너와 만날기회가 또 있다면 그때는 이 질문에 대한 답변을 말할 기회가 있었으면 좋겠어

2. Which expression do you use most often in colloquial style ?Are these correct and common sentences?

-I've never thought about it before. it's kina tough question~
-That’s a very interesting question, but unfortunately, I’ve never given it a thought.
-Gee I haven't thought about it all
-I've never thought about this topic before

3. I wanna learn the natural expressions of this sentence.

But let me give it a try

Question

Are these correct and common sentences?
Are these correct and common sentences? Change this into a more natural, friendly sentence.

1. If there is another chance to meet you Eva, then I would like to have a chance to answer this question.  
만약 에바 너와 만날기회가 또 있다면 그때는 이 질문에 대한 답변을 말할 기회가 있었으면 좋겠어

2. Which expression do you use most often in colloquial style ?Are these correct and common sentences?

-I've never thought about it before. it's kina tough question~
-That’s a very interesting question, but unfortunately, I’ve never given it a thought.
-Gee I haven't thought about it all 
-I've never thought about this topic before

3. I wanna learn the natural expressions of this sentence.

But let me give it a try

Answer

Hi, there! 
1- If there is another chance to meet you Eva, then I would like to have a chance to answer this question. 
It is correct. More street-wise, or colloquial would be: 
If I meet you again, Eva, then I would like to answer this question. 
You can use any variation (just to not to use the chance twice in a sentence.
2- 
- I've never thought about it before. It's kind of a tough question ~
-That’s a very interesting question, but unfortunately, I’ve never given it a thought.
-Gee I haven't thought about it all 
-I've never thought about this topic before

All of them are correct. Use the first one if you're a teenager =P Personally I don't like people that repeats "kind of" and "like" the whole time.

Your English is impressive. Keep it up!

Answer

1. 이게 제일 자연스러운 거 같아요: If we could (get a chance to) meet again sometime/another time, I'd like to answer your question.

2. "I've never thought about that/it before, to be honest"