The words are different from the original (Child) version but this is a close approximation of the song as performed by Sandy Denny.
"I forbid you maidens all that wear gold in hair To travel to Carterhaugh, for young Tam Lin is
None that go by Carterhaugh but they him a pledge their mantles of green or else their maidenhead"
Janet tied her green a bit above her knee And gone to Carterhaugh as fast as go can she
She'd not pulled a double rose, a but only two When up then young Tam Lin, says, "Lady, pull no more"
"And why you to Carterhaugh without command from me? " "I'll come and go", Janet said, "and ask no leave of thee"
Janet her kirtle green a bit above her knee And she's to her father as fast as go can she
Well, up then spoke her father dear and he spoke meek and "Oh, and alas, Janet," he said, "I you go with child"
"Well, if that be so," said, "myself shall bear the blame There's not a knight in all your hall shall get the baby's
For if my love an earthly knight, as he is an elfin grey I'd not change my own true love for any you have"
So Janet tied her kirtle green a bit above her And she's gone to as fast as go can she
"h, tell to me, Tam Lin," he said, "hy came you to dwell? " "The queen of fairies me when from my horse I fell
And at the end of seven years she pays a to hell I so fair and full of and feared it be myself
But is Halloween and the fairy folk ride Those would let true love win at Mile's Cross they must bide
So first let pass the horses and then let pass the brown run to the white steed and pull the rider down
For I'll on the white steed, the nearest to the town For I was an earthly knight, they give me renown
Oh, they will turn me in arms to a newt or a snake But hold me tight and not, I am your baby's father
And they will turn me in your arms into a bold But hold me and fear not and you will love your child
And they will turn me in your arms into a knight But cloak me in your mantle and me out of sight"
In the middle of the she heard the bridle ring She heeded he did say and young Tam Lin did win
Then up the fairy queen, an angry queen was she, "Woe betide her face, an ill death may she die"
"Oh, had I known, Tam Lin,'' she said, "what night I did see I'd have him in the eyes and turned him to a tree"