These 什么形式(tour) are from the USA

These 什么形式(tour) are from the USA There are more and more (tour)_______coming to Shanghai these days tour的动词形式 These are English books.改为单数形式 These are apples变成单数形式 are these your books?改为单数形式 These are apples改为单数形式 these are apples 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 these are new books.改为单数形式 these are chinese books 改为单数形式 are these desks?单复数形式 These are Chiese buses.变为单数形式 These are cakes 改为单数形式 these are 有缩写形式吗? these coats are yeiiow变单数形式 look at these girls ( )(dance).how haapy they are!括号里填dance的什么形式