To say “good evening” in Hebrew you literally say “evening good”, since adjective comes after nouns in Hebrew. Here is how you write it in the Hebrew alphabet:
ערב טוב
And here is how you write it with niqqud (Hebrew vowels):
עֶרֶב טוֹב
Here are the words that make up the phrase:
ערב = erev = evening
טוב = tov = good