what is this what is this(that) one?在什么情况下用,与what is this(that\it)有什么不同,怎样回答?

This is what I what What is this? 翻译what is this what is this? 翻译what is this What is this. 改错 this is what happens. what is this picture what is this mean? This is what they What is this meaning what is this called? This is what I fun what is this? what is this?thank! What is this place? this is what happened what is this?-It is.