pp-2-113

groundkeeper

Test-2, #113
That brought about the widespread extinction of the dinosaurs is unknown; it must, however, have invovled major changes in the environment.

that--->what, but what the difference is between that & what when we use the two words,any 牛牛could give me a scrupulous explanation or example, thanks a lot!

思愔奶茶

that 好像不能做居首，我猜的

思愔奶茶

that 好像不能做居首，我猜的

真老九

简单的讲，what==things (or people )+ that，这样讲不是很准确，但是有助于理解

比如这一句，A可以改为The thing that........，也可以改为what

victorhong2004

好象在托福里that 放句首一般都错

kongkuang

1.that 在句首引导主语从句时，只是一个引导词并不能作主语。

That money doesn't grow on trees should be obvious.

这种结构应尽量避免，应用It+be/seem

2.what可作主语，=the thing(s) that

                      -----"朗文英语语法"p26,p27

mylogo

我觉的have involved should be has involved,

kongkuang

以下是引用mylogo在2004-5-30 16:15:00的发言：
我觉的have involved should be has involved,

no. because there is a 'must'

so, it's  : must have been...