Hand is here是?Is this you dirty shirt?请指教

Hand is here是?Is this you dirty shirt?请指教
1.Hand is here,That is his car.
Hand is
2.That's a nice dress.这是新概念1第13课的.
是Tim说Short的裙子,为什么不是This,是因为裙子不在他手中?
他们俩正在交谈..
3.Is this you shirt?这是你的衬衣吗?
IS this you dirty shirt?这是你的脏衣服吗?(这样说?)
4.This is my red book.这是我的红色的书.或这红色的书是我的?
Those are my red book.这些红色的书是我的?
我现在很菜.呵.