96. Comma with adverbial clauses

Commas with adverb clauses - When an adverb clause is at the beginning of the sentence, it is an introductory clause and needs a comma separating it from the independent clause. If the adverb clause comes after the independent clause, the conjunction is enough to hold the two clauses together.

We will not have school today because it snowed last night.
Because it snowed last night, we will not have school today.