These things aren't hard to come by if you know where to look.

You simply needed to know where to look for them.

Those they leave behind do not know when to look for their return.

How he knew where to look I will never know.

How did he know where to look, what to press?

You just have to know where to look for them.

They only had to know where and when to look.

They do not know where to look most of the time.

Maybe you just have to know where to look for them.

Few had any family members who would even know where to look for them.