this is their two children 为什么用this is?

this is their (two)english lesson this is their two children 为什么用this is? this is their【】【love】son this is their clasroom.it is ( ) this的适当形式 1.This is their classroom(同义句) This is a man with two big He is in Grade Two this __________much is this ice cream two yuan This is my____visit to japan(two) Miss Wang:Good morning,Class,Here are two new studente.Their names a are Lucy and Lily.a ------- this is Lily. 中文意思:This song is for all those who are far away from home and their parents...This song is for all those who are far away from home and their parents.And especially,this song is for my dad who passed away because of cancer two months ago.Dad This is my brother is _____(twenty-two)birthday （A）John is twelve years old.His sister,Mary,is two years younger than he is.One day their mother asked them to clean the house.Because they did a good job,their mother bought a delicious cake and said to John,“John,cut this cake into two pieces 1.where is the post office (near) 2.liu ying is sitting in the row(two) 3.the students put their1.where is the post office (near) 2.liu ying is sitting in the row(two) 3.the students put their hands behind backs(they) 4.this is not my ruler is over t every year ___ people in this country lose their jobsmany millions millions of millions two millions This is their school的同义句是什么 改错：This is their plans for the weekend. This is their house的同义句是什么我急,