Read the full text of Love's Labour's Lost Act 4 Scene 3 with a side-by-side translation HERE.
Berowne enters with Speech #2 praising the pitch-ball eyes of Rosaline. He's got it bad. When he hears the King approaching, he hides.
The King comes in with a classic Shakespearean love-groan (4.3.4). Berowne is excitedly watching the King betray his oath with a drippy sonnet about weeping for her love.
But here comes Longaville. The King hides (separate from Berowne), and he and Berowne watch the action, commenting without hearing each other. Longaville fears he's not so good at poetry, but nevertheless reads his sonnet aloud. It's all about how his vow not to speak to women doesn't matter—because Maria's a goddess.
Guess who? Yes, it's Dumain's turn to enter and profess his love. Now Longaville, the King and Berowne are all hiding—separately—and spying on their lovesick friend. His poem is about wishing he were free as the wind to love her.
Just as Dumain has finished reading his poem out loud, Longaville jumps out of his hiding spot to blame him for loving Maria.
The King comes out next and chastises them both. He warns them that Berowne will be merciless when he gets wind of their love. They'll be teased to death.
He doesn't have to wait long to find out, as Berowne reveals himself and accuses the King of being in love, too. He has a heyday making fun of them, and lies about his own love.
But here come Jaquenetta and Costard, and you know what they have in their hands (i.e., Berowne's letter to Rosaline).
Costard presents Berowne's letter and calls it treason. The King, unsuspecting, lets Berowne read it. He tears it up.
Longaville sees through Berowne's little tantrum, and Dumain picks up the scraps of paper. He recognizes Berowne's handwriting.
Now Berowne has to admit it. He'll confess more but wants to get rid of the yokels first.
The boys skirmish about which of their loves is the most beautiful. Rosaline gets kind of trashed by the boys because of her dark hair.
The King calls a truce and asks Berowne how they can justify escaping their vow.
No problem. Berowne gives a long speech, the gist of which is: a) this vow didn't make sense in the first place, and went against all the virtues of youth; b) the best way to learn about beauty (and about how to write) is in a woman's eyes; c) being in love heightens your senses and powers of observation; d) love makes one brave, mysterious and musical. Let's go for it.
The boys need no convincing. They resolve to woo the women, starting with a little entertainment in their tents.