Choose the correct passive voice transformation of the sentence: The archaeologists, after many years of searching, have discovered a hidden ancient tomb.
A hidden ancient tomb has been discovered by the archaeologists after many years of searching.
The active sentence is 'The archaeologists ... have discovered a hidden ancient tomb', whose verb 'have discovered' marks the present perfect tense.
To convert to passive we make the object 'a hidden ancient tomb' the new subject and move the doer 'the archaeologists' into a 'by' phrase.
The passive of the present perfect follows the fixed pattern 'has/have been + past participle', so the tense signal 'have ... -ed' must be preserved, not changed.
The new subject 'a hidden ancient tomb' is singular, so the auxiliary is 'has', giving 'has been discovered' and keeping the original present-perfect meaning.
Option A uses the simple past 'was discovered', option C uses the past perfect 'had been discovered', and option D uses the simple present 'is discovered', so each alters the tense and is rejected.
The adverbial 'after many years of searching' stays put, attached to the action.
Hence, the correct passive form is A hidden ancient tomb has been discovered by the archaeologists after many years of searching.
Change the following sentence into the Active form.
Let the documents be submitted to the head of the department by the end of the week.
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People eat rice in many countries.
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The national anthem is sung at the beginning of every match.
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The report is expected to be delivered by the committee next week.
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Will the company launch the new product?
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Suhani has written a beautiful poem on how to make your country proud.
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Make sure that your children have completed their tasks before going to school.
Change the following sentence into the Active form.
The decision was made at the meeting.
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The concert will have been broadcast by the time we arrive.
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Have you placed an order for a cake?
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Walking zones have been demarcated using paints and cones by the municipal corporation.
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All previous ages are far surpassed in knowledge by our age.
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Give her a 50% raise in salary.
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The commanding officer ordered the troops to march ahead.