A BOYS sentence is basically a two – part sentence. The first part of the sentence always ends with a comma and the latter part always begins with a coordinating conjunction.The most popular coordinating conjunctions are :
But, Or, Yet (and) So
the first letters of which provide the mnemonic : BOYS
Teaching Tips :
Model how to turn two separate sentences into BOYS sentences
It was a beautiful morning for a walk. He set off happily.
It was a beautiful morning for a walk, so he set off happily.
To achieve this, stress the need to turn the full-stop into a comma and follow the comma with one of the coordinating conjunctions (BOYS words).