大全34

Cathelin

大全34
34. A wildlife expert predicts that the reintroduction of the caribou into northern Minnesota would fail if the density of the timber wolf population in that region is more numerous than one wolf for every 39 square miles.
(A) would fail if the density of the timber wolf population in that region is more numerous than
(B) would fail provided the density of the timber wolf population in that region is more than
(C) should fail if the timber wolf density in that region was greater than
(D) will fail if the density of the timber wolf population in that region is greater than
(E) will fail if the timber wolf density in that region were more numerous than
正确答案是D白大侠在解释AB选项时说在宾语从句中，主句使用虚拟语气WOULD DO，条件从句没有使用虚拟语气与之对应。
我就不明白主句使用虚拟语气WOULD DO，从句为什么就一定要使用虚拟语气与之对应。换句话说，若是把正确答案D中的WILL改成WOULD，正确性能否依然成立？
请教各位了！

tianwan

虚拟条件句必须保证主从句都是虚拟，否则语义荒谬。这是原则，无须证明。也就是说主句虚拟，从句也必须虚拟；从句虚拟，主句也必须虚拟。你查一下语法书中虚拟条件句的说明。

只有主句用should的时候（should不像would，should有时虚拟，would肯定是虚拟），从句根据情况用或不用虚拟。

Cathelin

唉，可能你还没明白我的意思，我当然知道虚拟条件句的用法了。这样好了，你就回答我的最后一个问题吧！怎么现在熟悉了，我就不和你客气的说声谢谢了！

tianwan

“我就不明白主句使用虚拟语气WOULD DO，从句为什么就一定要使用虚拟语气与之对应”，这是rule。“虚拟条件句必须保证主从句都是虚拟，否则语义荒谬......”我回答的就是这个问题。但关于should的错了，应该是从句中的should。

“若是把正确答案D中的WILL改成WOULD，正确性能否依然成立？”不成立。若是把正确答案D中的WILL改成WOULD，从句也必须用虚拟，否则语法上是错的。

Cathelin

知道了，谢谢斑竹！

quiny

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