As joining words, subordinators have two patterns of punctuation. If the subordinator is at the start of the first sentence, then there is a comma at the end of that sentence before the second sentence begins. Here is an example of that punctuation pattern:    Because the student had run out of [ Select ] money money; money, money. she could not afford the movie ticket. It is important to be careful with prepositions that are joining expressions because they must have a [ Select ] noun clause sentence after them instead of a [ Select ] noun sentence . Here is an example of a correct sentence:    Because of the price, the student could not afford the movie ticket.