I was to have returned you the book, but I was too busy that day.

我本来要将那本书还你的，可是我那天太忙了。

youdao

I was busy that day. Otherwise I would have gone there with them.

我那天很忙，否则，我就和他们一起去那儿了。

youdao

I'm busy that day, too. To be honest, any time you're free, I'm busy.

那天我也很忙。事实上，你有空的时候我都会很忙。

youdao

Susan Bass says that this year's Earth Day will be a busy one in the United States.

VOA: special.2010.04.21

Weiner, apparently not a very busy man, replies that day.

FORBES: Weiner Sexts: Less Sex, More Ego

That new Republican House majority has been busy passing legislation that would revive jobs and the economy since day one, when it voted to repeal Obamacare.

FORBES: President Obama's State Of The Union Confusion And Deception

And that made for a historically busy day in cyberspace.

CNN: Record traffic reported; government sites swamped