He often forgets himself because he is too absorbed in his work.

I use this regular service every week.

He undergoes a health checkup periodically.

A set date fair is held on the first Sunday of every month.

I bought a book of train tickets.

I gave her a gift certificate.

It seems I have misplaced my boarding pass somewhere.

I booked a flight ticket for my trip next week.

I bought a ticket for the concert.

I bought a ticket to ride the train.