After ḥaythu, identify the following clause before assigning roles. The words inside an attached nominal or verbal clause still have their own internal grammatical functions.
Additional example: أَجْلِسُ حَيْثُ يَجْلِسُ الْمُعَلِّمُ.
I sit where the teacher sits.
Ḥaythu: indeclinable adverb functioning in the accusative adverbial position; yajlisu: imperfect; al-muʿallimu: subject.