The three letters that could signal that the letter "c" is pronounced as /s/ are "c," "e," and "i." In certain contexts, when the letter "c" is followed by the vowels "e" or "i," it typically represents the /s/ sound. For example:
- "Cereal" is pronounced as /ˈsɪəriəl/.
- "City" is pronounced as /ˈsɪti/.
In these cases, the "c" takes on the soft sound of /s/ rather than the hard sound of /k/ that it usually represents.