I just don't know if it's really such a good idea to go.

I mean, it might not be a bad idea to go back in there.

I'd be happy to pay for a new one, but I have no idea where to go.

He knew it would be a bad idea to go back there.

He had no idea where to go, what to do.

It had been a good idea to go down and see that old woman again.

Do you think it is a good idea for me to go there alone?

Might be a good idea to go away for a while.

He stood looking from right to left, having no idea which way to go.

In fact it might be a good idea to go.