How many of William Shakespeare's original manuscripts have survived to the 21st century?

Any original manuscripts written by William Shakespeare have not survived to the 21st century. There is zero (absolutely no) original manuscripts to view at this point in our history. In fact, not so much as a single couplet written in Shakespeare’s own hand can be found to exist.

There is truly no hard evidence (documents, writings, etc.) which supports any fact that William Shakespeare of Stratford-upon-Avon (1564-1616) could even write a complete sentence. Given this fact, he is still revered as the greatest author of the English language.

There has been an ongoing debate about the authorship of the 154 sonnets and some 37 plays credited to Shakespeare. Some well known skeptics have long belittled the idea that a barely educated guy could write masterpieces of unrivaled beauty and sophistication. A 1903 example occurred when Henry James (a novelist of modernist literature) wrote to a friend that he was “haunted by the conviction that the divine William [Shakespeare] is the biggest and most successful fraud ever practiced on a patient world.”

Over time, other famous writers and doubters about Shakespeare’s accomplishments have included Mark Twain, Walt Whitman, Sigmund Freud, Orson Welles, and Sir John Gielgud.