1、The blue building is (the tallest) one in this city.
这栋蓝色的大楼是城里最高的一栋.
要用最高级的形式.
2、I visited my uncle and aunt two weeks ago.（用next week改写）
I will visit my uncle and aunt next week.
下周我将要去看望叔叔和婶婶.
改为一般将来时态.