1.how long 多久,多长,一般问时间
eg.How long should a murderer be kept in prison?
2.how much longer还要多久,与how long 相近
eg.How much longer can I hold this position?
3.how late最晚多久
eg.How late is your store open?
4.when 什么时候,在.时.
Try to be quiet when you are in library.
5.how far 距离多远,到什么程度
How far is it from your home to the supermarket..
6.how soon 多久之后,一般用于将来时
——How soon will she be back home?
——In an hour(一小时后）