In the phrase given in bold, the verb 'used' is in past/past participle form (V2/V3) but it requires a 'to-be' form of verb to be used along with the preposition 'to'. Among the options, 'not to be used' is the only option that is meaningful in the context of the sentence and also grammatically as the rest of the options either are contextually irrelevant or incomplete in meaning and are thus negated.
The correct sentence is: Taste enhancers are recommended not to be used often.
Hence, the correct answer is option (c).
Note:
V1 -> Base form/simple form of verb, V2 -> Past form of verb (-ed form or irregular verb), V3 -> Past participle form of verb (-ed, -d, -t, -en, or -n), V4 -> Continuous form of verb / Present participle form of verb (-ing form), V5 -> Third person singular (V1+ -es or -s).
A Preposition is a word placed before a noun or a pronoun or a noun equivalent (pronoun, adverb, gerund, infinitive, adverbial clause, or any clause that can be used as the object of the preposition) and shows a relationship in space or time or a logical relationship between two or more people, places, or things in a sentence.
Examples
I. The teacher scolded the child for being late.
II. We're going to a party.
· The words in bold are called prepositions because they normally take position before (pre) a noun/pronoun or a noun equivalent (pronoun, adverb, gerund, infinitive, adverbial clause, or any clause that can be used as the object of the preposition.
· The noun/pronoun which is used with a preposition is called its Object.
Study Notes
Category
