At the center of the square stood a tall monument?请问这句话用正常语序该如何表述?

1.At the center of the square stood a tall monument?请问这句话用正常语序该如何表述:
A tall monument stood at the center of the square .
2.to the north was * gate这句话用正常语序该如何表述:
* gate was to the north.(我是按你的要求翻过来的,这句我觉得更应该用is,因为语境陈述的是事实,所以用一般现在时.）
3.一般现在时和一般过去时的疑问和否定中,如何判断用BE还是DO：
给个简单的例句吧：Are you ok?这一句陈述语序是you are ok...be是系动词不可省略; Do you have a pen?这一句陈述语序是 ：you have a pen. do是省略的.所以就这样判断用BE还是DO...
4.现在完成时和现在进行时的特殊疑问句：
特殊疑问代词有：what who whose which when where how why等
以what为例：What have /had you done ? 现完就是have/has+ done, 过完就是had+done.
5.我刚关掉机算机.在过去的几年时间里,孩子们取得了很大进步?如何翻译
I cut off the computer just now.
In the past few years,the childrens have made great progress.
应该是初中生吧? 能够提出这些问题说明你一定可以学好英语的!