USAGE NOTE 用法说明: do
If someone asks you what you have done to something, you have probably changed it in some way. 如果有人问你 what you have done to... （你怎么把…弄成这样了），那么你可能把某物变了样:
What's he done to his hair? 他的头发怎么这样了？
However, if someone asks you what you have done with something, they usually want to know where it is. 但如果有人问 what you have done with..., 通常是想知道某物在哪里:
What did you do with my book? 你把我的书弄到哪儿去了？
If someone asks you what you do, they want to know what kind of work you do. 假如有人问 what you do, 那是想知道你干什么工作:
"What do you do?" "I'm a student." “你是干什么的？”“我是学生。”
However, if someone asks you what you are doing, they want to know what activity you are doing at that particular moment. 但如果有人问 what are you doing, 那是想知道在那一特定的时刻你正在做什么事:
"What are you doing. Sally?" "I'm making lunch." “莎莉，你在干什么？”“我正在做午饭。”