“干,做,作,办” 都可做动词 “干”[oral] = to do something. = 做 你干嘛 ?= 你做什么? “做” = to do, to make, to prouce, to act as 在做事， 做衣服， 做工，做官 等 用“作” 而不是“作” “作”= to compose, to write 作业，作曲用“作”,不是"做” "办” = to deal with, to handle, to attend to 办事，办公，办入学手续等 FYI.

A: 你干什么呢？ What are you doing now? B: 我做作业呢。 I am doing my homework. A: 你朋友呢？ How about your firend ?(Where is your friend?) B: 他出去办事了。He is out to handle affairs .

你在干什么？=你在做什么？（what are you doing?) 他正在作曲。(He is composing now.) 他在外面办事。(He is out to handle affairs. )