整天在干嘛英文怎么说呢

“整天在干嘛”的英文表达可以是 "What have you been up to all day?"。这句话的来源源于人们对别人的日常活动的关注和好奇。例如：

"I've been busy with work all day." (我整天忙于工作。)
"I've been trying to catch up on my reading." (我整天在忙于赶上我的阅读。)

希望这对您有帮助！