that is it, this is it

1. that is it
   就這樣子嗎?
   
   A:What would you like to buy for your mom?
   B:I am going to invite my mom to the Theme Park.
   A:That's it? (Is that it?或Is that all?也可以)
   
2. that is it
   就是這個
   
   That is it, looks just like ours.
   就是這個，和我們的很像。
   
3. this is it
   就是這裡
   
   Where is the party?
   This is it. Here, this location.