He wouldn't come ─ he said he was too busy.
他不願來，他說他太忙。
The line is busy ─ I'll try again later.
佔線——我過會兒再打。
I'll be too busy to come to the meeting.
我會很忙，不能到會。
Should anyone call, please tell them I'm busy.
如果有人打電話來，請告訴他我正忙著。
Try to get some rest ─ you have a busy day tomorrow.
休息一下吧——你明天還要忙一天呢。