how long與how soon都可以用來(lái)提問(wèn)時(shí)間.
但是how long一般用于提問(wèn)完成時(shí),例如：
How long have you been there?-I have been there for 3 years.
而how soon是用于提問(wèn)將來(lái)時(shí)的,例如：
How soon will you arrive here?-I will arrive here in 3 hours.
換一個(gè)說(shuō)法.如果答句中用的介詞是for前面就要用how long；如果是in,前面要用how soon
how long指的是多長(zhǎng)時(shí)間,多長(zhǎng)的長(zhǎng)度
比如:how long have you been collecting
dolls 你收集玩具多長(zhǎng)時(shí)間了?
how soon指的是多快, 比如how soon will you be there?你多快能到那兒?