in the sentences "O bardağı ağzına götürüyor." and "O burnuna dokunuyor." i notice the "ı" in "ağız" and "u" in "burun" are omitted...can someone explain more about this rule please? Thanks!!!!!!!!!!!!!

There are Turkish words that drop the last vowel when a suffix starting with a vowel is added. Here's the list.

i saw something like that in the word time (vakit)it became vaktimiz.