Questions & Answers about کلِ روز در خانه بودم.
Why use کلِ (kol-e) instead of همه (hameh) for "the whole"?
کل (kol) is best used when you mean the entirety of one specific thing, like the whole of a single day. It is linked to the noun with an ezafe (the -e sound) to make کلِ روز. If you used همه (hameh), it would normally be used for plurals or general categories, like همه روزها (all the days).
Is it common to keep the preposition در (dar) for "at" in everyday speech?
This sentence is written in a standard, slightly formal way. In conversational spoken Farsi, people usually drop the preposition در (in/at) entirely when talking about being at home. They also change the pronunciation of the noun, simply saying خونه بودم (khooneh boodam) instead of در خانه بودم.
Can I move کلِ روز (the whole day) to a different part of the sentence?
Yes, time expressions are quite flexible in Farsi. While putting them at the very beginning of the sentence is the most natural way to set the scene, you could also say در خانه بودم کلِ روز, though placing it at the end makes it sound more like an emphasized afterthought.