The base word is pay because 'pre' is a prefix. The prefix 'pre' means before.
Pay
To reduce thefts, cash customers are sometimes required to prepay for self-service gasoline purchases. I have to prepay my membership fee at the gym each month.
I said I would prepay for the dinner
Gift
what the base word for calculator
is the base word for studying ,base word for differently
I had to prepay for the trip.
I would like to prepay for our room.
Example sentence - We had to prepay for the book.
Please, prepay for all of your textbooks, so you can get them the day school starts.
Using a credit or debit card will allow me to prepay the shipping charges that are associated with this purchase. You'll get a nice discount if you prepay with your credit card.
To reduce thefts, cash customers are sometimes required to prepay for self-service gasoline purchases. I have to prepay my membership fee at the gym each month.
"Prepay" or "Prepaid"
She prepayed for the hotel room
I'd like to prepay for my tickets to the performance, please.
I said I would prepay for the dinner
Delay
of Prepay