1. 우와! 사람들이많네. 

 Wow! There are lot of people  ➜  Wow! There are a lot of people.

2. 그거 나한테 어려워?

 Is that difficult for me?  ➜​  Is it difficult?

3. 뭐? 자전거 타는거?자전거 타는 것은 쉽고 재미있어

 What? Riding a bike? Riding a bike is easy and fun. ✔​ ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​