There are certain little matters which I must keep to myself; and this is one of them.

My father has asked me to talk to you on a certain matter.

And as it happened, I did want to talk to her about a certain matter.

We paid him a great deal to help us in a certain matter.

We must settle certain matters before he may see you.

I have therefore found it necessary to bring certain matters to your attention.

But on certain fundamental matters, no amount of talking here will change anything.

Now I would like to speak on certain other matters that have been raised here.

He'll call us and ask what should he do with a certain matter.

Wondered if I mightn't consult you on a certain matter.