The spelling of "am concerned" follows the rules of English phonetics. The first sound is the vowel sound /æ/ as in "cat", represented by the letter 'a'. The second sound is the consonant sound /m/, represented by the letter 'm'. The final sound is the vowel sound /kənstənd/, represented by the letters 'c-o-n-c-e-r-n-e-d'. This is a reduced vowel sound, known as a schwa, which is common in English. So, the word "am concerned" is spelled phonetically as /æm kənˈsərnd/.
The phrase "am concerned" does not have a specific etymology as it is a combination of two common words.
The verb "am" is the first-person singular present indicative form of the verb "to be" in English. It comes from Old English "eom", which is derived from Proto-Germanic "*immi*" or "*h₁ésmi*".
The adjective "concerned" comes from the verb "to concern", which is derived from the Latin word "cōncernere". "Cōncernere" is a combination of the prefix "com-", meaning "together", and "cernere", meaning "to separate, sift, or distinguish".
When combined, "am concerned" simply means that the person speaking is expressing their worry or interest in a specific matter.