1. Have you used the Past Simple or the Present Perfect of the verbs in the brackets? Machu Picchu Have we known about

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1. Have you used the Past Simple or the Present Perfect of the verbs in the brackets? Machu Picchu
Have we known about Machu Picchu for over a century now?
Was this ancient Inca site discovered by archaeologists in 1911?
Have they written books and newspaper articles about their discovery?
Have people all over the world read about the site and wanted to see it for themselves?
Did the first tourists start to arrive in the 1960s?
Have millions of visitors been to Machu Picchu more than half a century later?
Have tourists from all over the world seen this marvelous Inca city with their
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own eyes? Did Machu Picchu become a UNESCO World Heritage Site in 1983? Have experts studied the site and its fascinating history for many years? Have they uncovered valuable artifacts and learned more about the Inca civilization through their research?

In this passage, the verbs are used in both the Past Simple and the Present Perfect tenses. Let"s analyze each sentence to identify the tense used and explain the reason behind it.

1. "Have we known about Machu Picchu for over a century now?" - Present Perfect
The Present Perfect tense is used here to indicate an action that started in the past and has continued until the present. In this case, the knowledge about Machu Picchu started in the past and is still ongoing at present.

2. "Was this ancient Inca site discovered by archaeologists in 1911?" - Past Simple
The Past Simple tense is used here to talk about a specific action that happened in the past and is now completed. The discovery of Machu Picchu by archaeologists is a specific event that occurred in 1911.

3. "Have they written books and newspaper articles about their discovery?" - Present Perfect
The Present Perfect tense is used here to describe completed actions that have a connection to the present. The action of writing books and articles about their discovery started in the past and has an influence on the present knowledge about Machu Picchu.

4. "Have people all over the world read about the site and wanted to see it for themselves?" - Present Perfect
The Present Perfect tense is used here to indicate actions that started in the past and have an impact on the present. People reading about the site and wanting to see it for themselves are actions that started in the past and still have relevance in the present.

5. "Did the first tourists start to arrive in the 1960s?" - Past Simple
The Past Simple tense is used here to describe a specific action that happened in the past. The arrival of the first tourists is a specific event that occurred in the 1960s.

6. "Have millions of visitors been to Machu Picchu more than half a century later?" - Present Perfect
The Present Perfect tense is used here to indicate actions that started in the past and continue until the present. The visitation of millions of visitors, which started in the past, is still ongoing.

7. "Have tourists from all over the world seen this marvelous Inca city with their own eyes?" - Present Perfect
The Present Perfect tense is used here to describe completed actions that have a connection to the present. Tourists seeing the marvelous Inca city is an action that started in the past and is still relevant at present.

8. "Did Machu Picchu become a UNESCO World Heritage Site in 1983?" - Past Simple
The Past Simple tense is used here to talk about a specific action that occurred in the past. The establishment of Machu Picchu as a UNESCO World Heritage Site is a past event that happened in 1983.

9. "Have experts studied the site and its fascinating history for many years?" - Present Perfect
The Present Perfect tense is used here to describe actions that started in the past and continue until the present. The studying of the site and its history by experts is an ongoing process that began in the past.

10. "Have they uncovered valuable artifacts and learned more about the Inca civilization through their research?" - Present Perfect
The Present Perfect tense is used here to indicate completed actions that have consequences in the present. The actions of uncovering artifacts and learning about the Inca civilization started in the past and have influenced the present knowledge.

By using a combination of the Past Simple and the Present Perfect tenses, the author effectively conveys the historical timeline of Machu Picchu"s discovery, exploration, and ongoing significance.