* Dah: This is the most common pronunciation and is used when "da" is followed by a consonant. For example: "da casa" (dah ka-sah) meaning "from home".
* Day: This pronunciation is used when "da" is followed by a vowel. For example: "da amico" (day a-mee-ko) meaning "from a friend".
It's important to note that the pronunciation of "da" can also be slightly affected by the following word, but the two main pronunciations above are the most common.