It is a common misconception that a conjunction cannot be used to start a sentence, but as we have seen, a subordinating conjunction can be used at the start of a sentence provided a comma is used to separate the two clauses.

You may also use a coordinating conjunction to begin a sentence. However, it is important to do this sparingly as using too many conjunctions at the start of sentences can make your speech or writing sound weak.

A conjunction is a way of linking together two thoughts or ideas in the same sentence. They are a useful device for avoiding the use of repetitive and choppy, short sentences and cause your speech and writing to flow.