Recently we have been learning how to use semi-colons accurately. Take a look at this picture; it uses commas where a semi colon would have been a better option.
A semi colon can be used to separate two main clauses in a sentence
e.g. The girl ran; she was being chased.
A semi colon can be used to add an additional main clause to a more complex sentence.
e.g. As I arrived home from school, the dog was barking because he had heard strange noises in the cellar; he was very unsettled.
In these cases the word after the semi-colon must refer to the subject in the main sentence.
Take a look at these descriptive paragraphs we have written. They all contain semi-colons which have been used successfully as described above.