Question

Nobody knows when this ancient monument was erected. Begin: no one knows how...

Answer 1

Explanation:

No one knows how and when this ancient monument was erected

Answer 2

Do as directed

No one knows how long ago  this ancient monument was erected.

Explanation:

• The given sentence, ' Nobody knows when this ancient monument was erected.' is a negative sentence.
• The word 'nobody' sets it as a negative sentence.
• The adverb of time 'when' is used to determine the doubt about the date and time the ancient monument was erected.
• If the interrogative adverb 'how' is used in the sentence a phrase relating to time has to be used.
• 'How' describes a manner or method or raises the question of the manner or method of something. In order to connect it with time the phrase 'long ago' has to be added.
• The phrase 'how long ago' works as a substitute for 'when'.
• The changed sentence is : No one knows how long ago  this ancient monument was erected.

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