The correct answer is Option (2) → taste
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Subject-Verb Agreement: The subject is "These grapes," which is plural. This requires the base form of the verb (taste) in the present tense.
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Verb Type (Stative Verb): "Taste" is used here as a stative verb (or linking verb) to describe the current sensory quality or condition of the grapes. Stative verbs are rarely used in continuous (progressive) tenses like "is tasting."
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Context: The sentence is describing the general, present characteristic of the grapes ("sour"). The simple present tense (taste) is used to describe current, habitual, or unchanging facts/qualities.
Why not other Options:
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is tasting → continuous tense is not used for senses (taste, smell, feel, look)
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tasted → past tense; not suitable since the comparison is happening now
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have tasted → incorrect structure for describing present taste
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