Dear Sam,
a. I hope you well!
b. Unfortunately, I have only one, so could you lend me your bicycle for the weekend?
c. I am writing this email to you because I want to borrow your bicycle.
d. I will return them to you on Monday morning.
e. My girlfriend and I are going to spend next weekend on the lake and we want to travel around the lake by bicycles.
Thank you. Hope to hear from you soon.
Jane