Incorrect. The conjunction “but” connects two independent clauses. The second clause requires a finite verb that agrees with “Brain fog,” so “change” should be replaced with “changes.” Example: “Stress can affect your mood and changes your behavior.” (Not: “Stress can affect your mood and change your behavior” when the intended subject remains “Stress.”)

Incorrect. The verb “caused” when used in passive constructions takes the preposition “by” to indicate the agent or reason. Therefore, “caused of” should be replaced with “caused by.” Example: “The accident was caused by reckless driving.” (Not: “The accident was caused of reckless driving.”)

Incorrect. After a modal verb like “may,” the base form of the auxiliary verb “have” must be used, not “had.” The correct structure is “may + have + past participle.” Therefore, “may had halted” should be replaced with “may have halted.” Example: “She may have forgotten about the meeting.” (Not: “She may had forgotten about the meeting.”)

Incorrect. “It’s” is a contraction of “it is” or “it has,” while “its” is the possessive adjective. Here, a possessive meaning is required to modify “name,” so “it’s” should be replaced with “its.” Example: “The cat licked its paws.” (Not: “The cat licked it’s paws.”)

Incorrect. The subject of the sentence is “flights,” which is plural, so the verb must also be plural. Therefore, “was” should be replaced with “were.” Example: “The flights were on time.” (Not: “The flights was on time.”)

Incorrect. The verb “miss” is followed by a gerund (verb + ing), not an infinitive. Therefore, “to swim” should be replaced with “swimming.” Example: “I miss playing tennis with you.” (Not: “I miss to play tennis with you.”)

Incorrect. The verb “order” is transitive and does not require the preposition “for” when directly followed by the object. Therefore, “ordered for” should be replaced with “ordered.” Example: “We ordered pizza for dinner.” (Not: “We ordered for pizza for dinner.”)

Incorrect. “Directly” is not a standard subordinating conjunction. The correct conjunction to indicate that one event happened immediately after another is “As soon as” or “The moment.” Therefore, “Directly the meeting began” should be replaced with “As soon as the meeting began.” Example: “As soon as the bell rang, the students left.” (Not: “Directly the bell rang, the students left.”)

Incorrect. “Lest” means “for fear that” or “in order to prevent” and is already negative in meaning, so it should not be paired with “should” in a conditional manner after “if.” The sentence structure is flawed. The correct structure should use “beware” or “be cautious” instead of “lest you should.” Example: “Work hard lest you fail.” (Not: “If you are a student, then lest you should fail.”)

Incorrect. The sentence attempts to connect two ideas but lacks a proper conjunction. The phrase “and at least one full year” creates a faulty coordination. A connector like “and” needs proper parallel structure, or the sentence should be restructured. The phrase should read “and at least one full year of uninterrupted preparation must go into getting into the civil services” with “the” added before “civil services” for correctness. Example: “It takes hard work to succeed and dedication to stay at the top.” (proper coordination) (Not: “It takes hard work to succeed and dedication staying at the top.”)

Incorrect. The superlative degree “most” is incorrectly preceded by the article “a.” Superlatives require the definite article “the.” Additionally, “homes” is plural, so the phrase should read “Even the most tightly sealed homes.” Example: “Even the most careful drivers make mistakes.” (Not: “Even a most careful drivers make mistakes.”)

Incorrect. The phrase “away to” is incorrect when indicating separation from a surface or object. The correct preposition is “away from.” Therefore, “away to” should be replaced with “away from.” Example: “Move the chair away from the table.” (Not: “Move the chair away to the table.”)

Incorrect. The sentence begins in the past tense with “was,” so the second verb in the compound predicate must also be in the past tense to maintain consistency. Therefore, “ensure” should be replaced with “ensured.” Example: “The team was motivated and performed exceptionally well.” (Not: “The team was motivated and performs exceptionally well.”)

Incorrect. The present continuous tense requires the auxiliary verb “are” before the present participle. Therefore, “we looking at” should be replaced with “we are looking at” or, for simple present, “we look at.” Example: “When we are looking at the data, we notice patterns.” or “When we look at the data, we notice patterns.” (Not: “When we looking at the data, we notice patterns.”)

Incorrect. The sentence is grammatically correct. The list “limited funding, fewer opportunities for international collaboration, and travel restrictions” maintains parallel structure with noun phrases. No error is present. Example: “She faces challenges like limited resources, fewer opportunities, and strict regulations.” (similar correct parallel structure).

Incorrect. The subject “Prevention” is singular, so the verb must also be singular. The parenthetical phrase “in mainstream medicine” does not affect subject-verb agreement. Therefore, “are” should be replaced with “is.” Example: “Education, in many countries, is highly valued.” (Not: “Education, in many countries, are highly valued.”)

Incorrect. The correct prepositional phrase is “due to,” not “due of.” Therefore, “due of a poor diet” should be replaced with “due to a poor diet.” Example: “The flight was delayed due to bad weather.” (Not: “The flight was delayed due of bad weather.”)

Incorrect. Part (4) has a punctuation error. A period or semicolon is needed after “now” since “Hurry up” begins a new sentence. Additionally, “don’t” should be spelled out as “do not” in formal writing, but the primary error is the missing punctuation between two independent clauses. Example: “It’s almost midnight now. Hurry up if you do not want to be late.” (Not: “It’s almost midnight now, Hurry up if you don’t want to be late.”)

Incorrect. After the phrase “regarded as,” an adjective is required, not a past participle used as an adjective. The word “matured” is incorrect; the correct adjective form is “mature.” Therefore, “matured” should be replaced with “mature.” Example: “She is regarded as intelligent enough for the role.” (Not: “She is regarded as intelligented enough for the role.”)

Incorrect. The preposition “outside” does not require “of” when used before a noun. Therefore, “outside of the family” should be replaced with “outside the family.” Example: “She lives outside the city.” (Not: “She lives outside of the city.”)