Ellipsis & Thay thế (tránh lặp trong văn viết chính thức)

# Ellipsis & Substitution (avoiding repetition in formal writing)

Ellipsis and substitution are cohesive devices used to avoid unnecessary repetition, making writing more concise and fluent. They are essential for achieving a high score in IELTS Writing Task 2, where clarity and precision are valued.

Ellipsis

Ellipsis involves omitting words that are grammatically predictable because they have already been mentioned or are implied by the context. It is common after auxiliary verbs, in comparative structures, and in infinitive phrases.

Structures and Formulas

• After auxiliary verbs: Subject + auxiliary + (main verb omitted)
  • She can speak French, and he can (speak French) too.
• In comparative clauses: Subject + verb + comparative + than + (omitted subject/verb)
  • The results were better than (the results) expected.
• In infinitive phrases: Verb + to + (infinitive omitted)
  • He wanted to go, but I didn't want to (go).
• In coordinated clauses: Clause 1 + conjunction + (omitted subject/verb)
  • The study was comprehensive and (the study) well-documented.

When and Why to Use

• To avoid redundancy: Especially when the meaning remains clear without the repeated words.
• To improve flow: Ellipsis creates tighter, more sophisticated sentences.
• In formal writing: Use sparingly; ensure the omitted words are recoverable from context.

Academic Writing Tips

• Use ellipsis after modal verbs (can, should, must) and auxiliary verbs (do, does, did).
• In comparisons, omit the repeated subject or verb if identical.
• Avoid ellipsis that might cause ambiguity; if in doubt, include the words.

Substitution

Substitution replaces a previously mentioned noun, verb, or clause with a placeholder word like one/ones, do/does/did, so/not.

Structures and Formulas

• Noun substitution: ... + one/ones (replacing a countable noun)
  • I prefer the old design to the new one.
• Verb substitution: ... + do/does/did (replacing a verb phrase)
  • He studies harder than his brother does.
• Clause substitution: ... + so/not (replacing a that-clause)
  • Will the plan work? I think so. / I hope not.

When and Why to Use

• To replace a noun phrase: Use one/ones to avoid repeating the noun.
• To replace a verb phrase: Use do to avoid repeating the action.
• To replace a clause: Use so for affirmative, not for negative.
• In formal writing: Substitution is more explicit than ellipsis and often preferred for clarity.

Academic Writing Tips

• Use one/ones after adjectives or determiners (the first one, a better one).
• Use do after comparatives or to avoid repeating a main verb.
• Use so/not after verbs like believe, expect, hope, think, suppose.

By mastering ellipsis and substitution, you can write more concisely and cohesively, meeting the criteria for a Band 7+ in Grammatical Range and Accuracy.