be begun和began的区别,

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be begun和began的区别,
"开始"begin在什么时候可以用被动be begun?
比如这一句吧
The Taj Mahal,which was begun in 1632 .很是不解.
(新概念第2册的练习题)
http://cache.baidu.com/c?word=the%2Ctaj%2Cmahal%2Cwas%2Cbegun&url=http%3A//61%2E142%2E127%2E155/Resource/GZ/GZYY/XGNYY/XGNYYZXD/tbjx0075zw%5F0011%2Ehtm&b=0&a=69&user=baidu
拉到最下面彩色的地方
为什么不用主动的began
并分析下began和be begun的用法,

再如：The bridge was begun five years ago and the estimated cost has already doubled.
建筑物动工这个概念,都用sth was begun
类似的我们可以说The bridge was started 5yrs ago.
当然一般begin用主动
如：
The film they want to watch begins at seven.
The meeting began promisingly,but then things started to go wrong.
电影开始,会议开始都是主动
但比较下就知道,桥梁不是开始,而是动工,所以被动

请问begun和began的用法 it began to rain 和 it had begun to rain 有什么区别 began 和begin 的区别 have begun 和have been on的区别 be fill with与began with的区别 began与begun读音有什么区别么?请教下老师, 求教 begin began bugun 的区别和各自用法是什么? Well begun,half done.begun的用法 wake 和 awake的区别 the baby in the next room awoke and began to be presented和be present的区别 should be 和 may be的区别 Can be 和must be的区别