Bebek büyüyor mu?

Questions & Answers about Bebek büyüyor mu?

Since the verb root has the vowel "ü", why is the question particle mu instead of ?
The question particle always follows 4-way vowel harmony based on the last vowel of the word right before it. The last vowel in büyüyor is the "o" in the -yor suffix, and words ending in "o" or "u" sounds take mu. Because the present continuous suffix is always -yor, the question particle for this tense will always be mu (or musun, muyum, etc.).
What is the root of the verb here, and how is the -yor suffix added?
The dictionary form of the verb is büyümek (to grow). To use it in a sentence, we first drop -mek to get the root: büyü-. Normally, you need to add a linking vowel before -yor, but because büyü- already ends in a narrow vowel (ü), we can attach -yor directly to make büyüyor.
Why doesn't the question word mu have a personal ending attached to it?
In Turkish, third-person singular subjects (he, she, or it) do not take a personal suffix. Since bebek (the baby) acts as a "he/she/it" subject, the sentence ends with the plain question particle mu. If you were asking "Are you growing?", you would add the "you" ending to make it Büyüyor musun?.

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