this is 与 it is有什么区别 还有 what is it 与 what is this

this is 与 it is有什么区别 还有 what is it 与 what is this This is my fault.与 It is my fault.有什么区别.this is 与 it is 分别在什么情况下使用? nor it is与nor is it有什么区别 it is possible与 it possible有什么区别? it is warm in this room和it warm in this room有什么区别? is 和is it 有什么区别 is this your bag?与is this bag yours?有什么区别 This is 和 It's 有什么区别?例如：This is my private letter.It's my private letter. It is not my shirt 和 This is not my shirt ,有什么区别 when 与 what time is it 有什么区别? There is no need与it is no need有什么区别?哪些词前用there is,哪些词前用it is? It is next to the park 与 It is next to the park 有什么区别? it is no use to do 与it is no use doing 有什么区别? whenever it is possible与if it is possible有什么区别 it is great to him与 it is great for him 有什么区别 how is it与 what is it有什么区别?如题 this is ...和it is...的区别 whose apple is it 与whose apple is this有什么不同