That is my watch．（改为否定句）________ ________ my watch．
These are math books．（改为否定句）These_________ _________math books．
He wants to be a great artist．（改为否定句）He________ ________to be a great artist．
I have to work every day. (改为否定句)
My son wants to watch TV after dinner every day.(改为否定句)
My brother has a car.(改为否定句)
That is a bag．（改为否定句）________ ________a bag．
He thinks he can pass the exam．（改为否定句）__________________
Both Mary and John are students．（改为否定句）