I'm at a loss for words.

I just don't know what to say.

I was in the mountains.

I'll call them tomorrow when I come back.

Then there is a problem...

When I grow up, I want to be a king.

I wish I could go to Japan.

I don't know how to demonstrate it, since it's too obvious!

I don't know what to do anymore.

What do you think I've been doing?

Let me know if there is anything I can do.

If you see a mistake, then please correct it.

When you're beginning to look like the photo in your passport, you should go on a holiday.

Seeing that you're not surprised, I think you must have known.

I can't live without a TV.

Let me know if I need to make any changes.

What if you gave a speech and nobody came?

It would be so cool if I could speak ten languages!

"If you're tired, why don't you go to sleep?" "Because if I go to sleep now I will wake up too early."

He would be glad to hear that.