Learn Turkish: Sınıftaki sessiz kızın kıkırdayacağı tuttu. - The quiet girl in the class had a sudden urge to giggle.

This uses the formula taught in this lesson: Verb + -(y)acak + possessive + tutmak (to hold/catch). Literally, it means 'her going-to-giggle took hold.' In Turkish, this specific combination is used to describe a sudden, uncontrollable urge to do something.

Why does kız take the genitive suffix -ın to become kızın?

Even though the girl is the one giggling, grammatically this structure is a possessive noun phrase. The whole phrase literally translates to 'The quiet girl's giggling took hold.' The genitive -ın on kız links to the third-person possessive suffix -ı at the end of kıkırdayacağı.

How are the suffixes on kıkırdayacağı broken down?

We start with the verb stem kıkırda- (giggle). Since it ends in a vowel, we need the buffer letter y before adding the future participle -acak. Finally, we add the third-person possessive -ı, which causes the consonant k to soften into ğ.

As a quick refresher, how does the word Sınıftaki work here?