Two reasons: great lines and great characters.
Actors love being able to say lines that are beautiful and sit well in the mouth. They are easier to remember and say than awkward badly written lines. Shakespeare wrote some of the best lines for actors to say.
Actors also love the challenge of Wrestling with a part that is not simple. Everyone wants to play Hamlet because he is a character full of contradictions, and everyone wants to try to get them all right.
A play by Shakespeare had been performed by the actors.
Having a bunch of amateur actors put on a play as a part of Shakespeare's play allowed Shakespeare to make fun of inept playwrights and actors which helped the audience appreciate the skill of Shakespeare and his fellow actors.
All Shakespeare plays, sad or happy or neither, have five acts.
Macbeth is the play that actors are superstitious about.
Yes. The first Folio lists a number of actors who played in Shakespeare's plays, and Shakespeare himself is at the top of the list.
All acting companies in Shakespeare's day had a permanent roster of players. Shakespeare did not write a play and then choose the actors for it; he had the actors and wrote the play for them. It is possible to see the difference between the parts written for Will Kempe when he was the company funnyman and the parts written for Robert Armin when he replaced Kempe.
Because Shakespeare changed the world for the better with his plays.
A play with a happy ending could be something like William Shakespeare's "A Midsummer Night's Dream," where the lovers are ultimately united and everyone is reconciled.
Actors inevitably play the roles in Shakespeare's plays, although some roles nowadays are played by actresses. Sometimes these are professional actors who earn their money this way, and sometimes they are amateurs who have a different day job. Either way, people who are not in interested in acting rarely play Shakespeare's roles (or indeed any roles).
Shakespeare's comedies have happy endings
Chamberlains men were the actors, so they would play the nomal plays Shakespeare suggested. Shakespeare also sort of ushered in the Globe Theatre with his writings.
This question makes no sense. If you mean "What parts did the actors in Shakespeare's company play?", the actors in Shakespeare's company played the parts assigned to them. "You, Will Kemp, will play Falstaff and you, John Sincklo, will play Poins." We do not know exactly which parts in the plays played by Shakespeare's company were played by which actors, with a few exceptions. We know, for example, that Will Kemp played the part of Peter in Romeo and Juliet. We can guess that he played Falstaff too.If you mean, "What parts did the actors in Shakespeare's play play?", there are a few plays in which there are actors as characters in the play, notably Hamlet, A Midsummer Night's Dream, and Love's Labour's Lost. In Hamlet, the Player King plays the king and the Player Queen plays the queen and one of the other actors plays Lucianus. In Midsummer Night's Dream, Bottom plays Pyramus, Flute plays Thisbe, Snout plays Wall, Starveling plays Moonshine, and Snug plays the Lion. And of course Will Kemp would have played Bottom, who was playing Pyramus.