Solve this multiple-choice question and choose the correct option.

Home » Verbal Ability » Sentence Improvement

Sentence improvement — noun clause as subject: keep the structure 'Why + clause + is not known'; the sentence 'Why the dinosaurs died out is not known' is already precise and formal.

Difficulty: Easy

it is not known
the reason is not known
that is not known
No improvement

Correct Answer: No improvement

Explanation:

Given sentenceWhy the dinosaurs died out is not known.

Concept/ApproachA wh- clause ('Why the dinosaurs died out') can function as a subject. This impersonal, academic pattern is standard: 'Why … is not known.'

Option analysis'it is not known'/'the reason is not known' → would require rephrasing the entire sentence and are less concise.'that is not known' → vague pronoun reference.

Final AnswerNo improvement

← Previous Question Next Question→

More Questions from Sentence Improvement

Sentence improvement — future time clause after 'until': use present simple for future reference and write 'until they arrive', not perfect/future forms.
Sentence improvement — first conditional with 'if' about tomorrow: use present simple in the if-clause — 'if it rains tomorrow' — not 'shall/will'.
Sentence improvement — unreal present with subjunctive 'were': write 'the whole world were banded' to match 'If I stood … I would …' structure.
Sentence improvement — parallel auxiliary structure: 'has not been and can never be in the good books' (supply past participle after 'has').
Sentence improvement — pronoun case in compound subject: use the subject form 'Anil and I' after the clause 'When the examinations were over …'.
Sentence improvement — choose the precise adjective for timekeeping: prefer 'accurate' rather than 'correct/right/regular' for clocks: 'Our office clock is not as accurate as it should be …'
Sentence improvement — correct phrasal verb for the end of difficulties: choose 'blown over' (not 'blown out/up/away') in 'The cloud of misfortunes appears to have blown over.'
Sentence improvement — remove redundant complementizer and fix number/capitalization: prefer 'While we would like all Indian children to go to school …' over 'we would like that all Indian Children …'
Sentence improvement — Choose the most idiomatic and temporally accurate wording for this civics/history sentence: ‘‘In India today many of our intellectuals still talk in terms of the French Revolution and the Rights of Man, not appreciating that much has happened since then.’’ Keep the time reference ‘‘since then’’ and ensure the aspect is standard, formal, and precise for SEO-focused English usage.
Sentence improvement — Polite conditional request form: choose the most natural modal construction to refine ‘‘I shall be grateful to you if you are of help to me now.’’ so the register is courteous and idiomatic.

Discussion & Comments

No comments yet. Be the first to comment!

Join Discussion