1)I was busy＋Ving
例句：I was busy cleaning.
例句：I was busy doing the chores.
2)I am busy＋Ving
例句：I am busy working.
例句：I am busy doing the chores.
1.Busy as a beaver
範例：I am busy as a beaver these days, trying to finish my paintings before the exhibition dates.
2.A lot on one’s plate
範例：I am sorry I can’t really help you out with your work this week as I already have a lot on my plate.
範例：I will have to skip this trip as I am slammed with a lot of work.
範例：Hey girl look like you really biz these days.
5.To be snowed under
範例：I was so snowed under with work today that I didn’t even have time for lunch.
範例：I can’t really take this new project, I am swamped with too much of work.