Here's why:
* Evolutionary process: Contractions didn't appear suddenly; they developed gradually over time.
* Informal vs. formal: Contractions were initially more common in informal writing and speech. Formal writing often avoided them.
* Earliest examples: Some early examples of written contractions can be found in Old English, but they weren't as widespread as they are today.
However, we can say that written contractions became more common and accepted during the Middle English period (roughly 1150-1500).
Here are some key points:
* Printing press: The invention of the printing press in the 15th century played a role in standardizing and spreading written contractions.
* Renaissance: During the Renaissance, a renewed interest in classical literature and languages led to a more conscious use of contractions in both formal and informal writing.
* 18th and 19th centuries: Contractions became increasingly common in written English, particularly in novels and plays.
It's important to remember that the use of contractions varies by context, style, and era. While they're generally considered acceptable in informal writing and speech, they may be avoided in formal writing, depending on the specific audience and purpose.