1、at all :完全,根本,多用于否定句,条件句。如用于肯定句,疑问句。可作 "真的,确实" 解。 Eg. If it were not for the sun,we could not live at all. 2、in all:总的来说,总之,一共。 Eg. There were twenty in all at the meeting. 会上共有二十人。 There were twelve of us in all for dinner.我们一共十二个人吃饭。