Learn Turkish: Çocuk masumca annesine baktı. - The child looked at his mother innocently.

It comes from the adjective masum (innocent) combined with the adverbial suffix -ca. In Turkish, adding -ca, -ce, -ça, or -çe to an adjective is a common way to turn it into an adverb, much like adding "-ly" in English. So, masum becomes masumca (innocently).

Can you break down all the suffixes on the word annesine?

Sure! The root is anne (mother). First, we add the 3rd person possessive suffix -si to mean "his/her mother" (annesi). Then, we need to add the "to/at" direction suffix (dative case) because of the verb. Whenever we add a case suffix to a 3rd person possessive, we must use the buffer letter -n-. Finally, we add the dative suffix -e. Altogether: anne + -si + -n- + -e = annesine (to his/her mother).

Why does "looked at his mother" translate using the dative suffix -e in annesine?

In English, we say "look at". In Turkish, the verb bakmak (to look) always requires the dative case, which is the "to/towards" suffix. Think of it as directing your gaze to someone or something. Therefore, you always use the -e or -a suffix before bakmak.