In the English grammar, the progressive be must follow an -ing verb. I could not find anything to support the verb to be + -ed. For example, "You better be prepared for tomorrow."
Learn English – Verb ‘be’ + -ed
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In the English grammar, the progressive be must follow an -ing verb. I could not find anything to support the verb to be + -ed. For example, "You better be prepared for tomorrow."
Best Answer
I think you are parsing the sentence slightly incorrectly. I would break it down like this:
You better (you better what?)
be (be what?)
prepared
Let's examine it in more detail.
You better is essentially a modal meaning you should. In English, we follow a modal with a bare infinitive. The bare infinitive of to be is just be. So this is a statement about what you should be. Prepared is a participle, which is a word formed from a verb (to prepare) that functions like an adjective. So this is essentially a sentence in the passive voice, which is usually formed with "to be" + a past participle.