what can I do 指我可以做什么···；我该怎么办?
例如：Jesus,what can I do now?天啊,我该怎么办?
What can I do on that day 在那天我可以做什么呢?
how can I do有我该怎么做···；我怎么能（我岂能）做···；也有我该怎么办的意思.
例如:How can I find the restaurant 我怎样能够找到那家餐馆?
How can I do that?我怎么能这么做呢?
I cannot find my mother.How can I do?我找不到妈妈了,该怎么 办啊?