Both before and after. There have been Greeks for over 3000 years, and there still are millions of them. Aristophanes and Alexander the great came before Shakespeare; Nana Mouskouri and Nia Vardalos came after.
He didn't start poetry. The Ancient Greeks wrote poetry 2,000 years before Shakespear.
Shakespeare came up with no conjunctions. They were all a part of the language long before he came along.
None. This was fourteen years before Shakespeare was born. They weren't even writing plays until the 1560s.
Good grief, no. The Greeks were.
Hardly. He did not even start English theatre. The Greeks were performing plays 300 years before Jesus was born. Nicholas Udall wrote the play Ralph Roister Doister when Shakespeare was a baby.
Plutarch's Lives of Greeks and Romans.
Shakespeare's play is based on Plutarch's Lives of the Greeks and Romans, which Shakespeare almost certainly took at school.
Shakespeare's pen.
The expression does not come from Shakespeare.
This is unknown, because only the Greeks wrote about their myths at that time.
Shakespeare didn't invent the idea of plays. It was the Greeks who did that. He did however write a number of them, for the purpose of making money for himself and his partners.
Before Shakespeare began writing plays he was an actor.