变为单数形式 are Chinese buses

变为单数形式 are Chinese buses These are Chiese buses.变为单数形式 What are they?They are buses改位单数形式 These are buses单数 考试题!There are many buses的单数形式. They are oranges.(变为单数形式） Are your teachers?变为单数形式. 改为第三人称单数形式（we are chinese) They are Chinese【改为单数形式】 these are chinese books 改为单数形式 Those aren't Chinese buses.改成单数 ——What are they?——They are buses.怎么改为单数形式