区别How soon/ofen/far/long?

how soon是对即将要到来的事的提问.比如how soon he will come?
how long是对长度或者时间跨度的提问.比如how long did he watch TV last night?
how often是对频率的提问.比如how often do you write to your father?
how far是对距离的提问.how far is it from here?