that's my book.this's your book.有没有语病

that's my book.this's your book.有没有语病 That's my book.This's your book. It's your book与This's your book. Is this your book?( ),it's( ) That‘s a ruler.(改为一般疑问句) Is this your book?(作回答) It is my ID 【英语】__my book.__your book.A.This is；That's B.This's；That's C It's this your pencil? -Yes,itis. It's that you book? -Yes,i Where s my book? This book ( ) Bob's.Look!That's his name. [1.This`s 2.this is 3.that]a book. This is my brother's book这里my brother's 都是修饰book吗? That' s my mother's book.改为否定句