There are certain days when I feel able to do it very well.
It's just two people having lunch on a certain day.
The workshops themselves are open to the public only on certain days of the year.
On a certain day of the days he forgot to take the key with him, and the second wife got into the room.
Until a certain day I can protect neither of you.
"We have close to 90 or 100 percent on certain days."
On certain days it is possible to see work being done inside the shed.
"Everything had to be applied to different areas of the body on certain days and at special times."
The civilians are free to use the hospital on certain days of the week.
Some events and certain days offer free admission to all.