こんな基本的なことも知らないなんて今まで何をやってたんだの英語

I still cannot understand what was wrong with it.

I didn't know what to do first.

I didn't know what to do first.

At first, I didn't know what to do.

They did not know what to do first.

I don't quite know how it happened.

Not knowing what to do, I did nothing.

I did not know till this moment that such was the case.

I have no idea what happened there.

At this point, I really don't know what to do.

You knew it wouldn't.

We were at a loss what to do.

I was drinking with total abandon and blacked/passed out. I have no idea what I was doing.

Truly, I didn't know what to say.

I do not know what motivated me to come here.

I didn't know whether [if] I were [was] coming or going.

I have no idea what I'm going to do now.

I don't know what I should do from here on out.

I could not make myself understood by him―make myself intelligible to him.

I completely didn't understand what you were saying.

Are you sure you don't know what it was?

I don't know how to decide the matter.

We haven't been able to find out anything about Grandma and Grandpa.

They didn't know what to do first.

We haven't been able to find out anything about Grandma and Grandad.

What's that thing? I have absolutely no idea.

I realized what it is that I'm lacking.

How come you never told me this before?

I don't know what's what.

I don't know what to do--I may as well flip a coin!