The student has learnt the answer by heart. Basic rules to be followed
A. The answer was learnt by the student by heart.
B. The answer is learnt by heart by the student.
C. The answer by the student was learnt by heart.
D. The answer has been learnt by the student by heart.
Right Answer is: D
Basic rules to be followed for Active/Passive conversions are:
1. The object of the active verb becomes the subject of the passive verb.
2. The finite form of the verb is changed (to be+ past participle).
3. The subject of the active sentence becomes the object of the passive sentence (or is dropped).
4. Preposition “by” is used before object.
The given sentence is of present perfect tense and it is in active form. The structures for active/passive voices are:
Active: Subject + has/have + verb (IIIrd form) + object…
Passive: Object + has/have + been + verb (IIIrd form) + by + subject…
So, the passive voice of the given sentence would be:
The answer has been learnt by the student by heart.