[SOMEWHAT SPOILER]
Friar Lawrence's plan was to give Juliet a vial to drink. It would put her in a deep sleep and she'd appear as dead, so her family would put her in the Capulet Family Tomb. The Friar was going to send Romeo a letter explaining this plan so that he may go to the tomb later at night so when she awoke from her sleep they could walk away and live life together again, but sadly the letter did not send and his plan backfired. In the end they both die a tragic death.
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He thought that if Romeo and Juliet got married, the fight between their families would end.
The Friar knows that Romeo & Juliet are already married when Paris comes to him in Act 4, Scene 1 of Romeo & Juliet. He tries to help Juliet so that she doesn't actually kill herself to keep from marrying Paris. - See more at: http://www.chacha.com/question/why-is-the-friar-willing-to-become-involved-in-solving-romeo-and-juliets-marriage-problems-in-act-4-scene-1#sthash.rxpVM9Fc.dpuf The Friar knows that Romeo and Juliet are already married when Paris comes to him in Act 4, Scene 1 of Romeo & Juliet. He tries to help Juliet so that she doesn't actually kill herself to keep from marrying Paris. he Friar knows that Romeo & Juliet are already married when Paris comes to him in Act 4, Scene 1 of Romeo & Juliet. He tries to help Juliet so that she doesn't actually kill herself to keep from marrying Paris. - See more at: http://www.chacha.com/question/why-is-the-friar-willing-to-become-involved-in-solving-romeo-and-juliets-marriage-problems-in-act-4-scene-1#sthash.rxpVM9Fc.dpufhd The Friar knows that Romeo & Juliet are already married when Paris comes to him in Act 4, Scene 1 of Romeo & Juliet. He tries to help Juliet so that she doesn't actually kill herself to keep from marrying Paris. - See more at: http://www.chacha.com/question/why-is-the-friar-willing-to-become-involved-in-solving-romeo-and-juliets-marriage-problems-in-act-4-scene-1#sthash.rxpVM9Fc.dpuf The Friar knows that Romeo & Juliet are already married when Paris comes to him in Act 4, Scene 1 of Romeo & Juliet. He tries to help Juliet so that she doesn't actually kill herself to keep from marrying Paris. - See more at: http://www.chacha.com/question/why-is-the-friar-willing-to-become-involved-in-solving-romeo-and-juliets-marriage-problems-in-act-4-scene-1#sthash.rxpVM9Fc.dpuf Because he is terrified that people will find out he married Juliet to Romeo without her father's permission. Their marriage was valid in the church, but it would also have been considered illicit from the standpoint of the law. His grand plan to bring peace to the families blew up in his face, and now he has a choice between committing a sin by marrying Juliet to Paris, or TELLING, and telling would probably get him into some trouble. He can't do either one, so he comes up with another grand plan to fake Juliet's death.
Juliet goes to friar Laurence's cell for help, so she doesn't have to marry county Paris. The friar is able to give her a solution and that solution is a potion in which can give Juliet a death like sleep in which she will wake up in forty-two hours.
He makes Juliet drink a potion and will keep her asleep for 48 hours so that she will seem dead to the people in her family.
Friar Lawrence went to the tomb to get Juliet out of there because she was about to wake up and he did not want to leave her awake, surrounded by corpses. He was going to bring her to his cell until Romeo can come and get her.
Juliet is worried that somebody other than the nurse and Friar Lawrence will find out that she married Romeo. She is trying to keep her marriage a secret because she thinks that people seeing a Capulet marrying a Montague will not accept it.