Understanding Passive Voice for Verbs of Sensation

The question asks us to convert the sentence "Lemon tastes sour" into the passive voice. This sentence uses the verb "tastes," which is a verb of sensation. Sentences with verbs like 'tastes', 'feels', 'smells', 'sounds', or 'looks' describing a quality of the subject don't follow the standard active-to-passive transformation where the object becomes the subject.

The typical structure for converting such sentences into the passive voice is:

Subject + linking verb (is/are) + adjective + when + pronoun (it/they) + is/are + past participle of the verb of sensation.

Let's apply this rule to the sentence "Lemon tastes sour."

• Subject: Lemon
• Verb of sensation: tastes
• Adjective: sour

Following the structure, the passive form should be "Lemon is sour when it is tasted."

Analyzing the Options for Passive Voice Transformation

Let's examine each given option to see which one correctly represents the passive voice of "Lemon tastes sour" according to the rules for verbs of sensation.

• Option 1: "Lemon has been tasted sour." This option uses the present perfect passive ("has been tasted") and does not follow the correct structure for verbs of sensation. It also changes the tense from the original simple present ("tastes").
• Option 2: "Lemon is tasted sour." This uses the simple present passive ("is tasted"). While grammatically valid in some contexts (e.g., "The soup is tasted by the chef"), it doesn't capture the intended meaning of the original sentence, which is about the lemon's inherent property of tasting sour when someone tastes it. It's not the standard passive transformation for this type of sentence.
• Option 3: "Lemon is sour when it is tasted." This option perfectly matches the required structure for passive voice transformation of sentences with verbs of sensation: Subject ("Lemon") + linking verb ("is") + adjective ("sour") + when + pronoun ("it") + is + past participle ("tasted"). This sentence correctly conveys that the lemon's property of being sour is perceived when it is tasted.
• Option 4: "Lemon has been sour when tasted." This option uses the present perfect tense ("has been sour") which is incorrect as the original sentence is in the simple present tense. It also doesn't quite match the standard structure.

Based on the analysis, Option 3 is the correct passive voice transformation of the sentence "Lemon tastes sour."

Revision Table: Active vs. Passive Voice with Verbs of Sensation

Additional Information: Understanding Voice in Grammar

Voice is a grammatical property of verbs that indicates the relationship between the verb and its subject. There are two main voices in English: active voice and passive voice.

• Active Voice: In the active voice, the subject performs the action of the verb. The focus is on the doer of the action. Example: "The dog chased the ball." (The subject 'dog' performs the action 'chased').
• Passive Voice: In the passive voice, the subject receives the action of the verb. The focus is on the action itself or the receiver of the action, rather than the doer. The doer, if mentioned, is usually introduced by the preposition "by". Example: "The ball was chased by the dog." (The subject 'ball' receives the action 'chased'). The passive voice is formed using a form of the verb 'to be' followed by the past participle of the main verb.

While passive voice is often used, active voice is generally preferred for clarity and directness in writing. However, passive voice is useful when the doer is unknown, unimportant, or when you want to emphasize the action or the receiver of the action.

Sentences with verbs of sensation followed by an adjective (like "Lemon tastes sour") describe a quality perceived through the senses. The standard passive transformation for these specific sentence structures is different from the general rule for transitive verbs.