من می‌دانم که تو ویژگی مهمی را پنهان می‌کنی.

Questions & Answers about من می‌دانم که تو ویژگی مهمی را پنهان می‌کنی.

Why does the object have both the indefinite -i suffix and the definite marker را (râ)?
This combination creates a 'specific indefinite' object. The suffix -i usually means 'a' or 'some', while را marks a specific target. Together in ویژگی مهمی را, they mean 'a certain important characteristic'. You use this pattern when you are talking about a specific thing that you know exists, but you aren't identifying exactly what it is.
Where exactly is the -i suffix attached in the phrase ویژگی مهمی?
It is attached to the adjective مهم (mohem - important), not the noun ویژگی (vižegi - characteristic). In Farsi, when a noun is followed by one or more adjectives using the connecting 'ezafe' vowel, the indefinite -i suffix always attaches to the very end of that whole descriptive phrase.
Why doesn't the second verb پنهان می‌کنی (penhân mi-koni) use the subjunctive mood after که (ke)?
Because the first verb is می‌دانم (I know). Verbs that express certainty, knowing, or stating a fact trigger the normal indicative tense in the following clause, not the subjunctive. Since you are stating 'you are hiding it' as an established fact, it stays in the normal present continuous tense.
Why is the object marker را placed before پنهان instead of right before the verbal part می‌کنی?
Because پنهان کردن (to hide) is a compound verb, meaning its two halves (پنهان and می‌کنی) act as a single verb unit. The marker را must go immediately after the noun phrase it marks (ویژگی مهمی), which means it sits right before the entire compound verb begins.

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