１．When the horse was leding to the stable,the wall of the house which nexts to the stable fell down.
正当这匹马要被牵进马棚时，靠近马棚旁的那座房子的墙塌了．（主句用的是过去进行时，从句用一般过去时）
２．Building a big and powerful dam is a symbol of achievement because it is not an easy project and needs nations and people themselves striving to work on it .
建造一个大的而又强壮坚固的水坝是一个成功的标志因为这不是一项简单的工程，它需要人们奋力拼搏来建造它．（一般现在时）
３．It is one of nature\'s great ironies that the availability of using the nitrogen in the soil frequently causes an upper limit on plant growth even though the plant\'s leaves are in a sea of nitrogen gas.
这是大自然的一个极大的讽刺-即使植物的叶子沉浸在氮气的海洋中，植物频繁地利用土壤中的氮使它们达到了生长的上限．（一般现在时）
（上面都没有按真题的思路去写，基本上是自己想的，还请楼主多多指教！呵呵！）
欢迎来到免费考研网www.freekaoyan.com
1、The house shares the wall with the stable lodged a group of cattle.
这房和那牲口棚共用一个墙。
Stable 马厩讲时
Share 分享，共用
The stable bases of the walls are of the essence to a house.
对一间房来说，有根基稳固的墙是很重要的。
of the essence 不可少的，很重要的
2、It is not blamable to illustrate that building a big, powerful dam act as a symbol of achievement for nations and people striving to assert themselves.
把建一个宏伟的大坝作为民族努力确保自身存在的代表性成就来阐述，这个观点是无可责难的。
Illustrate 阐述
Assert＝ To defend or maintain 维护
act as 作为
3、It is one of nature\'s great ironies that the availability of nitrogen in the soil frequently sets an upper limit on plant growth even though the plants\' leaves are bathed in a sea of nitrogen gas.
这真是自然界的巨大的讽刺，土壤中所能获得的氮肥量对植物的生长构成了一个上限，虽然植物的叶子被沐浴在一片氮气的海洋中。
be bathed in 沐浴于
