When they started to wonder what had become of you.

I started to wonder how come he was taking so long.

But then you start to wonder if you're up to the job.

At some point, you know, one has to start to wonder.

I started to wonder if this had been a good plan, after all.

"They start to wonder how these things are possible and that means they're thinking."

Another five minutes and I started to wonder if he was coming back.

But then when we found all this money I started to wonder.

But after about a week, I started to wonder where my books were.

And if it didn't, he would start to wonder what had gone wrong.