Sentence Correction: Tenses: Passive

Which of the following is the **active** equivalent of this **passive** sentence? > {color:purple}The equirectangular projection was invented by Marinus of Tyre around 100 AD. {/color}
Not quite. The original sentence does not includes the **Past Perfect** *had invented*. The transition to **active** should not involve a change in the sequence of events.

Well done!

This answer choice shows the correct **active** form of the sentence. Since the original contains the **passive verb** _was invented_ and you know that the **passive** involves adding the **verb** _to be_ in some form, by taking away the *was* and making it clear ==who== completed the verb *invented*, you produce an **active** sentence.
Not exactly. Moving the **prepositional phrase** *around 100 AD* to the front of the sentence does not change this **passive** sentence to **active**. A change must be made to the **verb**, instead.

The passive equivalent of this answer choice is John will be hired by Doodle.

The original sentence includes the verb have. The transition to passive does not involve elimination of words. Thus, the correct answer should also include the verb have.

The correct answer is Doodle will have hired John.

The passive equivalent of this answer choice is John has been hired by Doodle. Note that the original sentence is in the future tense, whereas this answer choice is in the present tense.

The correct answer is Doodle will have hired John.

Marinus of Tyre had invented the equirectangular projection around 100 AD.
Marinus of Tyre invented the equirectangular projection around 100 AD.
Around 100 AD, the equirectangular projection was invented by Marinus of Tyre.

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