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Example sentence:
Don't be sad, everything will turn out fine.
I've seen "Don't worry" used like this, so I think it's not ungrammatical. But part of me, sees "Don't be sad" as a complete sentence, so I'm a bit skeptic about this usage.
Maybe it's grammatically correct to start a sentence with an imperative sentence?
In English speech, the end of a sentence is indicated with a lowering of voice pitch.
Sometimes two closely related sentences are spoken one directly after another, and pitch is/would be lowered or lowered only very slightly. A comma can be used instead of a period to mark this.
Have an English speaking friend, if possible, read the sentence to you with a comma and then with a period.
