Are you ready? Let's repeat the phrases. I have no idea. I can't help you there beats me. I'm not really sure. I've been wondering that too.

How should I know? Don't ask me. Search me. Your guess is as good as mine. Who knows? It's anyone's guess.

Don't know. I don't have that information here right now. Okay, good job. Let's move to the next part. Your dad asks you, if you know anything about the invention of electricity, then you would have no information. So what do you say?

I have no clue. I can't help you there. Your friend asks you Do you know where is Mary? Our classmate? Then you would say that you are not expected to know. So what do you say?

How should I know? Don't ask me. Your teacher asks you what will happen in the future if you keep cutting trees? Then you want to say that it's not possible for anyone to know. So what do you say? Who knows?

It's anyone's guess.