英语语法比如 The box is so heary that we can't carry it什么时候后面要加 it

The box is so heary that I can't carry it.{改为同义句} The box is so heavy that Kangkang can't carry it.还能改为SO...Th the box is so heavy that i can't carry it The box is so heavy that I can't carry it. 1.The box is so heavy that I can't carry it. The box is so heavy that I can't carry it.变为同义句The box is ( The box is so light that the boy can carry it.The box is lig The box is so heavy that I can not carry it中的heavy和that之间需要加 按要求改写下列句子 The box is so heavy that I can’t carry it（ 改为同义句） This box is so heavy that i can`t carry it.（改为同义句）This box i The bag is so heavy that we can't carry it.改为同义句 The bag is The bag is so heavy that that I can't carry it.The bag is (