can someone help me due date is today i mark you as brainliest

Answer:
THE FIRST ONE IS A RUN ON SENTENCE.
THE SECOND ONE IS NOT A RUN ON SENTENCE.
THE THIRD ONE IS ALSO A RUN ON SENTENCE.
Explanation:
A RUN ON SENTENCE CONTAINS TWO COMPLETE SENTENCES.
FOR EXAMPLE:I LOVE TO WRITE PAPERS I WOULD LOVE TO WRITE ONE EVERYDAY.THIS IS A RUN ON SENTENCE.