ج، ش، ي involve the middle of the tongue and the opposing upper palate, provided ya is not a long-vowel letter. They are also known as the shajariyyah letters.
ج involves middle-tongue contact and release.
ش produces audible friction from this region.
ي when pronounced as a consonant, as in يَد, is not the open long vowel.
Distinguish the long ya in قِيلَ (jawf) from the consonantal ya in يَد (middle tongue).