have nothing to do but ……do 还是to do?

问题描述:

have nothing to do but ……do 还是to do?
我说的是to do后面接do还是to do?(一楼六楼是不是误会了)给个统一意见吧……
三楼既然说是do,那么为什么例句中是slept?五楼例句中是doing?是都可以么?

have nothing to do but do sth.
例如:I had nothing to do but slept all the time last Sunday.