Breakdown of گربهها باید تو خونه کثیفکاری کرده باشن.
خانه
house
گربهgorbe
cat
درdar
in
کردنkardan
to do / to make
Questions & Answers about گربهها باید تو خونه کثیفکاری کرده باشن.
How does this sentence express the past deduction "must have made"?
To show that you are guessing or deducing something happened in the past ("must have..."), Farsi uses bâyad (must) followed by a verb in the Present Perfect Subjunctive. In this sentence, that combination is bâyad ... karde bâshan (must have done). The Present Perfect Subjunctive is formed by taking the past participle karde and adding the subjunctive forms of the verb "to be", which here is bâshan.
What is the literal translation of the compound verb kasif-kâri kardan?
The word kasif means dirty, and kâri means work or doing. So kasif-kâri literally means dirty work or making a mess. Combined with the helper verb kardan (to do), the full compound verb kasif-kâri kardan means to make a mess.
Why does the verb end in bâshan instead of the formal bâshand?
This sentence is written exactly how people speak in everyday life. In spoken Farsi, the third-person plural ending -and usually drops the final "d" sound, turning into just -an. Therefore, the formal written karde bâshand becomes karde bâshan in conversation.
What other words in this sentence show that it is in a casual, spoken register?
There are two other clear examples here. First, tu is the very common conversational shortcut for dar (in) or (inside of). Second, is the standard spoken pronunciation of the formal written word (house).