A missing small word can make a sentence feel incomplete: “Please send copy of letter” needs more work than choosing the correct verb. The reader also needs to understand which copy and which letter you mean.
The articles-and-plurals section of Jobin Thomas’s The Grammar Advantage for OET Writing links article choices to countability and specific reference. This guide turns those checks into a noun-phrase review using original study and administrative examples.
Find the main noun before choosing its article
In “a clear written explanation,” the main noun is “explanation.” “Clear” and “written” describe it. Identifying the main noun helps you decide whether you are referring to one countable item, several items or something normally treated as uncountable.
A singular countable noun generally needs a determiner in ordinary prose: “a form,” “the form,” “this form” or “her form.” The correct choice depends on the meaning, not just on whether the sentence sounds formal.
Distinguish an item from an uncountable concept
“Information,” “advice” and “equipment” are normally uncountable in these uses. Write “useful information,” “some advice” or “the equipment.” To count individual units, choose a suitable expression, such as “two pieces of advice.”
Original noun-phrase repairs
Draft: “Please send an information about the appointment.”
Repair: “Please send information about the appointment.”
Draft: “The tutor provided two useful advices.”
Repair: “The tutor provided two useful pieces of advice.”
Draft: “Please attach copy of the letter.”
Repair: “Please attach a copy of the letter.”
Ask whether the reader can identify the noun
“A letter” introduces a letter without identifying it. “The letter you sent yesterday” identifies a particular one. Information elsewhere in the sentence or shared context can make a noun specific even on its first mention.
For that reason, “first mention means a or an” is only a rough learning pattern. The useful question is whether the reader can identify what you mean in this context.
Check the sound after a or an
Choose “a” or “an” according to the following sound: “a useful explanation” but “an unusual explanation.” The adjective can change the choice even when the noun stays the same.
Read the entire phrase, including any adjective, rather than selecting an article from the noun alone. “A form” becomes “an updated form,” because the next spoken sound changes.
Complete the noun phrases
1. Please send ___ updated copy of the timetable. (a/an)
2. The learner needs some useful ___. (advice/advices)
3. I received a form yesterday. ___ form requires a signature. (A/The)
Answers: 1 an — the next word begins with a vowel sound. 2 advice — uncountable here. 3 The — it refers back to the identified form.
Review a paragraph through its noun phrases
Underline the nouns in one paragraph. Check their type, number and reference, then read the phrases with their modifiers. This catches errors that a verb-only proofreading pass can miss.
Record the complete corrected phrase, not just “article error.” A note such as “an updated copy of the timetable” gives you a pattern you can use accurately in a new sentence.
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OET Grammar — Course 14
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Source: tense oet wr 100.epub, Jobins Training. Examples labelled original or illustrative were written for this article. Independent exam preparation; no affiliation with or endorsement by the examining body. Practice does not predict an official score.