Use Present Perfect to: (has/ have+ past participle)
- talk about things that happened up to now 到目前为止发生的事情
People have cleared forests to grow crops. 人们砍伐森林来种植庄稼。
- say that something happened in the past but has an effect in the present 过去发生的事但对现在有影响
The animals' habitat has suffered. 动物的栖息地受到了影响。
- say that something started in the past but is still happening now 过去开始但现在仍在继续的事情
Tigers have always lived in thick jungles. 老虎一直生活在茂密的丛林中。