明天我有事情要做。
I have something to do tomorrow?
Sorry but I am tied up all day tomorrow.
用I have something to do来表示您很忙,这也完全是中国式的说法。因为每时每刻我们都有事情要做,躺在那里睡大觉也是事情。所以您可以说我很忙,脱不开身:I’m tied up.还有其他的说法:I can’t make it at that time. I’d love to, but I can’t, I have to stay at home.