Here's how I sing it. I was proud to sing it to my daughter on her wedding day:

One morning, one morning, one morning in Spring
To see the green fields, hear the nightingale sing
I met a fair maiden who to me did sing
I'm going to get married next Monday morning.

Sixteen years old is too young for to marry
Take my advice, for a year or two tarry
At least pretty maiden, wait until the next Spring
And put off your wedding next Monday morning

You talk like a man without sense, without skill
Four years I have tarried against my own will
And now I'm determined to have my own fling
I'm going to get married next Monday morning

Next Monday morning I'll tie back my hair
Put on white stockings and dress me with care
And six pretty maidens like linnets will sing
And dance at my wedding next Monday morning

Next Monday evening when I go to my bed
I'll turn and I'll look at the man I have wed
And all around his middle my two arms I'll fling
Goodbye, pretty maidens til Tuesday morning.

I learnt it from a singer in a folk club about 40 years ago and presumably he learnt it from a record somewhere. Judy Cook of Washington DC knows an American version.

Enjoy

Gwilym