Grammar correction: personal endings, agreement, and double plurals
During a composition exercise, a candidate writes four Persian sentences and submits them for correction. The sentences are: (1) 'من کتاب را خواند.' intended: 'I read the book.' (2) 'او به مدرسه رفتند.' intended: 'He went to school.' (3) 'دو کتابها روی میز است.' intended: 'Two books are on the table.' (4) 'دانشجویان خوبان آمدند.' intended: 'The good students came.' The teacher marks three errors but does not explain them. The candidate has a grammar test tomorrow with 10 short-answer items, each asking for a correction plus a one-line rule. The candidate knows the vocabulary but confuses past-tense personal endings, subject-verb agreement, and plural formation. The candidate has 15 minutes to prepare. The candidate must identify which sentence contains more than one error, decide the order in which to correct them, and write rules that will generalise to new items.
1. Which sentence contains more than one error, and what are the errors?
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Sentence 3 contains two errors. First, دو کتابها combines the numeral دو with the plural suffix -ها, producing a double plural. Persian does not normally say 'two books' with both markers; use دو کتاب or کتابها without دو. Second, the verb است is singular, but the intended subject 'two books' is plural. With a numeral subject, Persian may allow a singular verb, but if the candidate keeps کتابها as the subject, the verb should be هستند.
Sentence 4 also has a plural problem: دانشجویان خوبان uses a plural adjective after an already plural noun. The correct attributive form is دانشجویان خوب. Sentence 1 lacks the first-person ending, and sentence 2 uses a plural verb with a singular subject.
2. Correct all four sentences and give a one-line rule for each error type.
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- (1) من کتاب را خواندم. Rule: the past simple verb takes a personal ending that matches the subject; خواند is third-person singular, so it cannot mean 'I read'.
- (2) او به مدرسه رفت. Rule: a singular subject takes a singular verb; رفتند is third-person plural.
- (3) دو کتاب روی میز است or کتابها روی میز هستند. Rule: do not combine a numeral with the plural suffix -ها; choose one plural strategy and make the verb agree with the chosen subject.
- (4) دانشجویان خوب آمدند. Rule: an adjective used attributively does not take the plural suffix when the noun is already plural; خوبان is a nominal plural, not the normal attributive form here.
3. The candidate has 15 minutes. What should be revised first, and why?
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Revise in order of frequency and transferability, not in the order the sentences appear.
- Personal endings (5 minutes): These recur in every past-tense verb and are quick to self-test by writing خواندم، خواندی، خواند، خواندیم، خواندید، خواندند.
- Subject-verb agreement (5 minutes): Practise singular and plural subjects with است/هستند and رفت/رفتند. This prevents the sentence-3 verb error.
- Plural formation (5 minutes): Drill the choice between دو کتاب and کتابها, and the difference between خوب as an adjective and خوبان as a nominal plural.
This order gives the candidate general rules that can be applied to new test items. Merely memorising the four corrected sentences would not transfer to the 10 short-answer items.