1.This drug has no effect on fight against cancer.2. There has seldom been so much protest against the Bomb.句子中的against部分是干什么成分呢？

1.This drug has no effect on fight （名词）against cancer. （定语）

2. There has seldom been so much protest （名词）against the Bomb.（定语）

网友记住这两条规则：

1. 修饰名词的介词短语是“定语”。

2. 修饰动词的介词短语是“状语”。

以上两句为定语；以下两句为状语。

He fought against the disease for a long time.

他同疾病做了长期的斗争。

The group protested against the countrys foreign policy.

这个团体反对国家的对外政策。