I'll be at home all morning.

我一上午都在家。

I didn't think you'd be at home but I just called by on the off chance.

我想你不会在家，只是碰碰运气顺路来看一下。

Will you be at home then?

那时你在家吗？

You may go and try your luck; he may be at home.

你去碰碰看，他也许在家。

He'd be at home in Buckingham Palace or at the bottom of a coal mine, he said.

“无论在白金汉宫，还是在煤矿坑底，他都很自在吧。”他说。