Yes, he made the Unbreakable Vow with Draco's mother, Narcissa Malfoy, in the "Spinner's End" chapter of Harry Potter and the Half-Blood Prince. He promised to watch over Draco and keep him safe, to help Draco with his task (killing Dumbledore), and to kill Dumbledore himself if Draco couldn't do it.
Snape kills Dumbledore
She visited him to see if he knew what the Dark Lord wanted her son Draco to do && if the Dark Lord wanted Snape to carry on the task if Draco failed also she wanted Snape to make the Unbreakable Vow && help Draco so he would not be hurt.
Narcissa
In Harry Potter and the Half-Blood Prince, Severus Snape and Narcissa Malfoy performed the Unbreakable Vow. This is the ultimate magical promise, as if Snape chose to break this promise, he would die. Snape promised whilst holding hands with Narcissa and with the Bonder (witness) Bellatrix Lestrange, that he would assist Draco Malfoy in his task of killing Albus Dumbledore if Malfoy struggles or is in danger of failing. Snape obliged willingly, as Dumbledore and Snape has already planned Dumbledore's death.
snape promises to protect malfoy (you spelt it wrong) because at the time of the unbreakable vow being made, snape is trying to convince bellatrix that he is working for the dark lord, so he does not want her to think he is trying to help dumbledore. Also, snape knows that dumbledore is going to die soon anyway. dumbledore knows malfoy is trying to kill him, so he wants snape to keep an eye on Draco malfoy, and promising to protect him was a good reason to follow him around.
The Unbreakable vow the unbreakable vow which is when snape makes the vow if he breaks it he dies
Snape agreed to make a magical vow called the unbreakable vow. He swore to protect Draco Malfoy.
severus snape
I seriously doubt it, because Snape's parents aren't in Deathly Hallows, not even in a flashback. Snape's parents appear only once in the series, when Harry breaks into Snape's mind in Order of the Phoenix and sees some of Snape's childhood memories. And that's only in the book, not the movie.
wat do you mean dracos?
Snape kills Dumbledore
Draco's mother makes me promise. She's upset and wants nothing but the utmost protection for her child. She begs Snape to make the Unbreakable Vow and lay his life on the line for him.
She visited him to see if he knew what the Dark Lord wanted her son Draco to do && if the Dark Lord wanted Snape to carry on the task if Draco failed also she wanted Snape to make the Unbreakable Vow && help Draco so he would not be hurt.
Narcissa
In Harry Potter and the Half-Blood Prince, Severus Snape and Narcissa Malfoy performed the Unbreakable Vow. This is the ultimate magical promise, as if Snape chose to break this promise, he would die. Snape promised whilst holding hands with Narcissa and with the Bonder (witness) Bellatrix Lestrange, that he would assist Draco Malfoy in his task of killing Albus Dumbledore if Malfoy struggles or is in danger of failing. Snape obliged willingly, as Dumbledore and Snape has already planned Dumbledore's death.
snape promises to protect malfoy (you spelt it wrong) because at the time of the unbreakable vow being made, snape is trying to convince bellatrix that he is working for the dark lord, so he does not want her to think he is trying to help dumbledore. Also, snape knows that dumbledore is going to die soon anyway. dumbledore knows malfoy is trying to kill him, so he wants snape to keep an eye on Draco malfoy, and promising to protect him was a good reason to follow him around.
Lily Evans and James Potter. I'm obsessed with the series. :)