There was one thing I must know to begin with.

Want to learn about the history of the Senate, but don't know where to begin?

The reason's very complex, and to tell you the truth I would not really know where to begin.

So it'll take a while before we even know where to begin.

It would be hard to know where to begin, she decided.

He said you would know where to begin looking for him.

I wanted to say something, but didn't know where to begin.

What I found in the main, though, were people who would like to do right but don't know where to begin.

He has so much to tell them and does not know where to begin.

They had too much, and didn't know where to begin.