However, she did have certain memories that people could confirm weren't hers.

From certain vague memories I am inclined to think my own mind wandered at times.

I'd have given anything to deliver you from certain memories, but other people do not think that way.

The two families had now nothing in common save certain childish memories.

Maybe he wanted certain memories to die a natural death.

It could be that he has certain memories just too painful to remember.

I definitely didn't want to run across someone who might be able to dredge certain memories out of the long gone past.

Perhaps certain memories were what he hoped to flush down the drain.

Example 2.: A smell might bring up a certain memory.

I just had to do something to erase, well, certain memories.