He is not only intelligent but also he is hardworking. (Improve)

• A. but also hardworking (Answer)
• B. but also is hardworking
• C. but he is also hardworking
• D. No improvement

'Not only...but also' requires parallel structure — both parts should follow the same grammatical pattern. Correct: 'not only intelligent but also hardworking', removing the redundant repeated subject and verb.

She likes neither tea nor she likes coffee. (Improve)

• A. neither tea nor coffee (Answer)
• B. neither tea or coffee
• C. neither the tea nor the coffee she likes
• D. No improvement

'Neither...nor' should join two parallel elements of the same kind — here, two nouns. Correct: 'She likes neither tea nor coffee', not a repeated clause.

He is both a good singer and dances well. (Improve)

• A. both a good singer and a good dancer (Answer)
• B. both good singer and good dancer
• C. both sings well and dances well
• D. No improvement

'Both...and' must join two grammatically parallel elements. 'A good singer' (noun phrase) and 'dances well' (verb phrase) do not match. Correct: 'both a good singer and a good dancer'.

Either you apologise or you will face the consequences. (Improve)

• A. or face the consequences
• B. or you will facing the consequences
• C. No improvement (Answer)
• D. or you will faced the consequences

'Either...or' correctly joins two complete parallel clauses here, each with its own subject and verb. No improvement needed — students sometimes wrongly shorten the second clause, changing the sentence's intended emphasis.

The company's success depends not on luck but hard work. (Improve)

• A. but on hard work (Answer)
• B. but with hard work
• C. but from hard work
• D. No improvement

'Not X but Y' requires both elements to be introduced the same way. Since 'on luck' uses the preposition 'on', the second element also needs it: 'but on hard work'. Omitting the repeated preposition breaks parallel structure.

She spends her free time either reading novels or she watches movies. (Improve)

• A. either reading novels or watching movies (Answer)
• B. either to read novels or watch movies
• C. either read novels or watches movies
• D. No improvement

'Either...or' must join grammatically identical structures. 'Reading novels' (gerund phrase) must be matched by another gerund phrase: 'or watching movies', not a full clause 'she watches movies'.

The report was praised not only for its clarity but also because it was concise. (Improve)

• A. but also for its conciseness (Answer)
• B. but also being concise
• C. but also to be concise
• D. No improvement

'Not only...but also' requires matching grammatical forms. 'For its clarity' (preposition + noun) must be paralleled by 'for its conciseness', not a subordinate clause 'because it was concise'.

The professor is known both for his research and he teaches very well. (Improve)

• A. both for his research and his teaching (Answer)
• B. both for his research and he teaches well
• C. both his research and for his teaching
• D. No improvement

'Both...and' must join two grammatically equal elements. 'For his research' (prepositional phrase) must be matched by 'his teaching', not a separate clause 'he teaches very well'.

The scheme aims not merely to reduce poverty but also at improving literacy. (Improve)

• A. not merely at reducing poverty but also at improving literacy
• B. not merely to reduce poverty but also to improve literacy
• C. Both A and B are acceptable (Answer)
• D. No improvement

Both revisions restore parallelism — either both elements as gerunds after 'at' or both as infinitives with 'to'. The original mixes an infinitive with a prepositional gerund, breaking the correlative structure.

Not only was the film praised by critics, but audiences also loved it thoroughly. (Improve)

• A. but also audiences loved it
• B. but the audiences too loved it
• C. No improvement (Answer)
• D. but loved it also the audiences

'Not only' at the start of a sentence correctly triggers subject-auxiliary inversion in its own clause ('was the film praised'). The second clause, introduced by 'but', does not require inversion and correctly uses normal word order. No improvement — this tests over-correction of correlative inversion rules.