如何区分how soon how ofen how long我老分不清怎么用这三个词,

如何区分how soon how ofen how long我老分不清怎么用这三个词,
如何区分how soon how ofen how long
我老分不清怎么用这三个词,

如何区分how soon how ofen how long我老分不清怎么用这三个词,
how soon是问多快..多久..是将来时
how often是问频率
how long是问持续多少时间.