Modern Chinese 2 Short Answers Many public places have posted "No Smoking" signs. Is it a phrase or a sentence?

If there is an exclamation point or a period after "No Smoking", it is a sentence; If there is no exclamation point or period after it, it is a phrase.

phrases belong to the standby unit of sentences, but many phrases add a certain tone and intonation to become sentences. Simply put, no punctuation at the end of a sentence (period, question mark, exclamation point) is a phrase, and with punctuation at the end of a sentence, it is a sentence.