When incorporating direct quotations into writing, what is the function of parentheses?

Read the excerpt from julius caesar, act 5, scene 5. brutus. why this, volumnius. the ghost of caesar hath appeared to me two several times by night—at sardis once, and this last night, here in philippi fields. i know my hour is come. volumnius. not so, my lord. brutus. nay, i am sure it is, volumnius. thou seest the world, volumnius, how it goes. our enemies have beat us to the pit, [low alarums] it is more worthy to leap in ourselves than tarry till they push us. which prediction about the plot does this passage most support? brutus will replace caesar. brutus will take his own life. brutus will surrender to his enemies. brutus will be forever haunted by caesar.

For english i have to find 4 errors in each diary post

Can someone me with an english language arts assignment? i need someone who's an expert or good at english language ! i need correct answers only !