字幕列表 影片播放 列印英文字幕 this is everyday grammar. I'm and I'm Rossiya. I read a science story the other day, and it said researchers have discovered important relationships between different types of animals. I see where you're going with this. The writer used the present perfect tense, right? Why would the writer use the present perfect tense? English speakers use the present perfect tense to talk about actions or states that happened in the past. These actions or states continue into the present or they're still important. In the present, you will often see verbs of discovery used in the present perfect tense, particularly in academic writing. Writers views the verbs to tell about past research or studies. These results continue to be important. So that is why the science writer wrote. Researchers have discovered important relationships between different types of animals. Common discovery burbs that are frequently used in the present perfect tense include discover, find show on reveal. Do you know how to make the present perfect tense of these birds?