These are black flowers?怎么改成单数句

These are black flowers?怎么改成单数句 these are his watches怎么改成单数句 There are some flowers in the kitchen.(改成单数句) Are these pairs of gloves nice?改成单数句 these are some arms(改成单数句） These are flowers.改成一般疑问句 These are our books改成单数 These are American cars 改成单数 These are our books.(改成单数） these are beautiful flowers.(同义句) Are these ugly ducking swimming in the pond?改成单数句 these are my black shorts. 同义句