Gabriel appeared to Mary and announced something, he said,
Luke 1:
After he said this, Mary replied, saying
Mary knew about marriage and - meaning nothing prurient here - knew how babies were made. Mary was to wed Joseph. What did she mean then when she said "how can that be?" and added as a reason why she was surprised about the prediction, "since I know not man"?
Luke 1:
26 When the sixth month came, God sent the angel Gabriel to a city of Galilee called Nazareth,
27 where a virgin dwelt, betrothed to a man of David’s lineage; his name was Joseph, and the virgin’s name was Mary.
28 Into her presence the angel came, and said, Hail, thou who art full of grace; the Lord is with thee; blessed art thou among women.✻
29 She was much perplexed at hearing him speak so, and cast about in her mind, what she was to make of such a greeting.
30 Then the angel said to her, Mary, do not be afraid; thou hast found favour in the sight of God.
31 And behold, thou shalt conceive in thy womb, and shalt bear a son, and shalt call him Jesus.
32 He shall be great, and men will know him for the Son of the most High; the Lord God will give him the throne of his father David, and he shall reign over the house of Jacob eternally;
33 his kingdom shall never have an end.
After he said this, Mary replied, saying
34 But Mary said to the angel, How can that be, since I know not man?
Which is odd, very odd. Gabriel's message is promissory, it is a word from God about the future. He says "thou shalt conceive" and he says "and shalt bear a son", and "and shalt call him Jesus.", and "He shall be great", and also "and men will know him for the Son of the most High", and finally "the Lord God will give him the throne of his father David, and he shall reign over the house of Jacob eternally". It's all about what will happen in the future. And Mary is introduced to us as betrothed to Joseph who will be her husband - God sent the angel Gabriel to a city of Galilee called Nazareth, 27 where a virgin dwelt, betrothed to a man of David’s lineage; his name was Joseph, and the virgin’s name was Mary.Mary knew about marriage and - meaning nothing prurient here - knew how babies were made. Mary was to wed Joseph. What did she mean then when she said "how can that be?" and added as a reason why she was surprised about the prediction, "since I know not man"?