Are they eggs?如何改为单数句?

Are they eggs?如何改为单数句? they are eggs改为单数句 They are some eggs on the desk.该单数改为单数句子！ They‘re eggs 改为单数句 they are apples改为单数 they are waitresses(改为单数 There are some eggs in the basket改为单数句 These are eggs.(改为单数句）_ _ _eggs. There are some eggs in the basket改为单数句 these are eggs in english(改为单数形式） Those are eggs.（改为单数句）怎么办? are there any eggs in the box?改为单数形式 把They are apples.改为单数句 Are they students?（改为单数句） What colour are they?改为单数句 are they apples?改为单数形式 they are English books.(改为单数形式) Are they American cars?改为单数 为啥