[求助]请教几个语法问题,还有6天考,急...

1.（THAN 后面可以省略什么？） 

就是说在比较的时候说more than...或者...er than的结构时,THAN后面可以省略的东西和不能省略的东西...?这样的题我总是错...

2.are not caused VS are caused not  有什么区别?

3.were it to do so,是怎么用呢...?什么意思?

多谢大家啦!!!!!!!!!!!!!!!!!!!!!!!!!!

那什么情况可以省略所有的东西,直接接物体呢?

建议楼主搜索“比较”。简单说一点我知道的皮毛。比较要看比较双方的句子结构。如果是SVO than SVO的话，如果是比较主语，则需要加谓语动词，否则会造成主语和宾语比较的歧义。如果是比较宾语，则than后面的SV如果相同可以省略：I eat more apples than oranges; I eat more apples than you do; I eat more apples than you. 这三句话里面，最后一句是不可取的。

谢谢~!明白了

可是were it to do so 怎么用呢? 有人知道吗?

我做的题目里面是说是表示虚拟语气,可是我没有见过这样的用法...

Antarctica receives more solar radiation than does any other place on Earth, yet the temperatures are so cold and the ice cap is reflective, so that little polar ice melts during the summer; otherwise, the water levels of the oceans would rise 250 feet and engulf most of the world’s great cities.

1. is reflective, so that little polar ice melts during the summer; otherwise,
2. is so reflective that little of the polar ice melts during the summer; were it to do so,

3. so reflective that little polar ice melts during the summer, or else
4. reflective, so that little of the polar ice melts during the summer, or
5. reflects so that little of the polar ice melts during the summer; if it did