Can you have a sentence without noun?

It's tricky! A sentence traditionally needs a noun (or pronoun) to act as the subject. Here's why:

* Sentences need a subject: The subject is the person, place, thing, or idea that performs the action of the verb.

* Nouns and pronouns are subjects: Nouns and pronouns are the most common words used for subjects.

However, there are some exceptions:

* Imperative sentences: These give commands and often don't have an explicit subject. For example, "Stop!" or "Go now!" The subject is implied to be "you."

* Infinitive phrases: These can sometimes act as sentences, especially in informal speech or writing. For example, "To err is human."

So, while a true grammatical sentence technically needs a noun or pronoun, there are some cases where it might seem like you have a sentence without one.