Learn Romanian: Băiatul doarme în acest dormitor.

In Romanian, the word for "the" (the definite article) attaches to the end of the noun instead of being a separate word in front. The base word for "boy" is băiat, and adding -ul makes it băiatul ("the boy").

The dictionary form of the verb "to sleep" is a dormi. Why does it change to doarme here?

Romanian verbs often have vowel changes in their root when they change to match the subject. For a dormi (to sleep), the o changes to oa for the "he/she/it" form. So, "he sleeps" becomes el doarme.

Why is it acest dormitor instead of acesta?

Acest is used for "this" when it comes directly before a masculine or neuter noun. If you want to put "this" after the noun, you use acesta, but then the noun needs "the" attached to it, making it dormitorul acesta. Both mean "this bedroom".

Is the word dormitor related to the verb doarme?

Yes! Just like "bedroom" in English describes the room's purpose, dormitor comes from the root verb a dormi (to sleep). The ending -tor often shows a place or tool used for an action.