Just what that certain idea is may never be pinned down.

I have certain little ideas of my own about that will.

When she spoke next, it was as a person who has certain ideas in their mind and wants to find out what someone else knows.

She has certain ideas and she's not afraid to tell you about them.

There are also certain traditional cultural ideas about women which make it more difficult for girls to get an education than their male counterparts.

She has a certain idea about Paris, 'the city of light' you know.

We can even study his relationship to certain ideas or to the information flow in society.

This Parliament has certain ideas and we are very happy to give them to you.

At this moment a certain idea came into his head.

And certain ideas can be very dangerous to our line of work.