To bring any information back into your mind from memory
remember
So lost in thought that one does not realize what one is doing
absentminded
To remember an experience with happiness
reminisce
To think of or come up with an idea
conceive of
To focus on doing a particular activity
concentrate on
To help someone else to remember certain information
remind
To consider or think carefully about doing some action usually in the future
contemplate
To form an image in one's mind or to think of something that doesn't really exist
imagine
A synonym of remember
recall
An expression that describes when you completely forget something
draw a blank
