一般疑问句和肯否定回答:This is a ruler

Is this a ruler?
Yes,it is./No,it isn't.句型转换: My mother is forty years old.(forty years old)Jane is Class 10，Grade 7.(Class 10，Grade 7.)My telephone number is 83422392(83422392) They are Mary and Kate(Mary and Kate)I am Mike.(同义句)I am in Class One ，Grade Seven./Jane is in Class Two，Grade Seven.His face is round.(同义句)括号的是要转换的 后面还有-.-How old is my mother?Which class is Jane in?What's my telephone number?Who are they?My name is MIke.这个不会He has a round face.