Scientists successfully conducted a water detection test on Mars ........

English ( Master) Active/Passive voice

In the following question, a sentence has been given in Active/Passive Voice. Out of the four alternatives suggested, select the one which best expresses the same sentence in Passive/Active Voice.

Scientists successfully conducted a water detection test on Mars.

A water detection test on Mars conducted successfully.

A water detection test on Mars is conducted successfully.

A water detection test on Mars has been conducted successfully.

A water detection test on Mars was conducted successfully by scientists.

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Explanation:

Solution: 4

The given sentence is in active voice, as the subject is performing the action. The tense of the sentence is Simple past, which follows-

Active – S + V2 + O

Passive – O + was/were + V3 + by + S.

The passive form of the sentence is correct in option D.

Including an explicit "by the..." phrase is optional. The ‘scientists’ are the agent performing the verb's action in this active voice sentence. As it is not mentioned in any of the given options, we can go with option D.