Understanding Voice: Active vs. Passive

The question asks us to convert a sentence from passive voice to active voice. Understanding the difference between these two voices is crucial for mastering sentence structure in English grammar.

In the active voice, the subject performs the action. The structure is typically: Subject + Verb + Object.

In the passive voice, the subject is acted upon. The structure is typically: Object + Be Verb + Past Participle + (by Subject).

The given sentence is "By whom was the coffee made?". This is a passive voice interrogative sentence (a question).

• The subject of the passive sentence is "the coffee".
• The verb is "was made" (a form of 'be' + past participle).
• The doer of the action is mentioned using "by whom".

Converting Passive Voice to Active Voice

To convert a passive sentence to active voice, we need to identify the following:

1. The object of the passive sentence (which becomes the subject in the active sentence).
2. The doer of the action (usually found after 'by'). This becomes the subject in the active sentence.
3. The verb tense used in the passive sentence. We must use the same tense in the active voice.

Let's apply this to "By whom was the coffee made?":

• The object in the passive sentence is "the coffee".
• The doer of the action is "whom" (used as the object of the preposition 'by'). In the active voice, this becomes the subject, "who".
• The verb is "was made". The 'be' verb "was" indicates the simple past tense. So, the active verb must also be in the simple past tense. The simple past tense of "make" is "made".

So, the structure for the active voice question will be: Who + Simple Past Verb + Object?

Applying this, we get: Who + made + the coffee?

The active voice sentence is "Who made the coffee?".

Analyzing the Options for Active Voice Conversion

Let's examine the provided options and see which one correctly represents the active voice of "By whom was the coffee made?", keeping the tense consistent (simple past).

1. Who made the coffee?
   • Subject: Who
   • Verb: made (simple past tense)
   • Object: the coffee
   • This sentence follows the active voice structure and uses the correct simple past tense matching "was made".
2. Who had made the coffee?
   • Subject: Who
   • Verb: had made (past perfect tense)
   • Object: the coffee
   • This uses the past perfect tense, which does not match the simple past tense of the original passive sentence.
3. Who has made the coffee?
   • Subject: Who
   • Verb: has made (present perfect tense)
   • Object: the coffee
   • This uses the present perfect tense, which does not match the simple past tense of the original passive sentence.
4. Who makes the coffee?
   • Subject: Who
   • Verb: makes (simple present tense)
   • Object: the coffee
   • This uses the simple present tense, which does not match the simple past tense of the original passive sentence.

Based on this analysis, the option that correctly expresses the given passive voice sentence in active voice while maintaining the original tense is "Who made the coffee?".

Comparison Table: Passive vs. Active Voice Conversion

Revision Table: Key Concepts in Voice Change

Additional Information on Active and Passive Voice

Understanding when to use active or passive voice is important for clear communication. Active voice is generally preferred because it is more direct, concise, and clear. It emphasizes the doer of the action.

Passive voice is useful when:

• The doer of the action is unknown or unimportant.
• You want to emphasize the action or the object receiving the action.
• You are writing in a formal or scientific context where objectivity is desired (e.g., "The experiment was conducted...").
• You want to avoid naming the doer of the action.

Changing voice involves careful manipulation of the sentence structure, verb form (especially the 'be' verb and the past participle), and sometimes prepositions ('by'). Always double-check that the tense remains consistent between the original sentence and the converted sentence.