Here's why:
* Conjunctions connect words, phrases, or clauses. They are the "glue" that holds your sentence together.
* The common refers to a noun or pronoun that is shared by both parts of the sentence.
* To avoid repetition, we use the common before the conjunction.
Here are some examples:
* Correct: The cat and the dog are playing in the yard.
* Incorrect: The cat and dog are playing in the yard.
* Correct: She and her brother are going to the store.
* Incorrect: She and brother are going to the store.
In short, always place the common element before the conjunction. This creates a smoother and more grammatically correct sentence structure.