Yes - BUT a noun must follow in the end. Also, it must be singular and non-specific; use 'the" to mark specific things. We use a/an/the to mark most things in a sentence.
1. "She is young", or "She is a young GIRL."
2. "This is a nice shirt". Skipping the "a" is not possible unless you use the plural and are talking generally: "These are nice shirts."
Dropping the article a/an/the is only possible if you're talking generally, or giving the name of a person or place. More or less.