The Lone Ranger

The Lone Ranger was a comic strip character [1] who roamed the Wild West enforcing the law. But the Lone [2] Ranger was never really alone [3], he had help; he had his Native American sidekick [4], Tonto. Like the Lone Ranger, adjectives can’t stand alone either, unless they come after state verbs, like be, become, get or feel; they need to be accompanied by nouns after action verbs: I feel good. I get tired.

So you can say: 

I'm single. 

But not:

I’m a single.

So add a noun after the adjective:

I'm a single man.

Or substitute the adjective with a noun::

I’m a bachelor.

Likewise, you can’t say:

I saw young protesting in the square.

I saw the young protesting in the square.

So add a noun after the adjective:

I saw the young people protesting in the square.

Or substitute the adjective with a noun:

I saw the youths protesting in the square.

We often enjoy things better when we’re in good company, and adjectives are no different!

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[1] personaje de una tira cómica, [2] en solitario, [3] solo, [4] compinche