How much are these T-shirts?(改为单数形式)

are,much,t shirts,white,how,these连词成句 How much are these T-shirts?much是不可数的 而回答They are 60 dollars these are new books.改为单数形式 these are chinese books 改为单数形式 are these apples?改为单数形式 Are these sheep怎么改为单数形式 Are these your cousins改为单数形式 These are English books.改为单数形式 are these your books?改为单数形式 these are apples 改为单数形式 These are cakes 改为单数形式 These are apples改为单数形式