They aren't apple trees.改为单数 Open the door,piease.否定句

They aren't apple trees.改为单数 Open the door,piease.否定句 they aren't apple trees.改为单数句? They aren'r apple trees改单数 plese open the door改为否定句 Open the door,please.(改为否定句) 英语题,教教我吧!they aren't apple trees．（改为单数句）＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿O These are apple trees(改为单数句) 1.They aren't reading the books.(改为单数形式) could you please open the door?改为否定句 Don't open the door until the bus stops.改为同义句Open the door _ No, they aren't.改为单数形式 Don't open the door (改为肯定句)