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--__will they stay in shenzhen?--they will stay there for a

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--__will they stay in shenzhen?--they will stay there for a month.
为什么不能用how soon 而是how long?how soon 不是用于将来时吗?how long不是用于过去时吗?
--__will they stay in shenzhen?--they will stay there for a
“how often,how soon,how long”三组词语都可译为“多……”,它们在表时间时很容易让人混淆.今天,我们隆重推出这三“兄弟”.
A) how often
how often常用于询问某动作在单位时间内所发生的次数,是对频度时间状语提问的词语.频度时间状语可以是often,usually,always,sometimes,never等副词,也可以是once a week,three times a month等副词短语.与how often相似的短语how many times(多少次),后面常跟限定的时间,如:how many times a week / a day / a month / a year,并且要回答出次数.如:
—How many times a week does he play basketball?
—He plays basketball three times a week.
B) how soon
how soon(多久)主要用来询问某个动作在多久的将来发生,即多久,多快.它常用在将来时态中,并且用in短语(表示再过多长时间)回答.如:
—How soon will he be back?
—He will be back in a month.
C) how long
how long(多久),主要用来询问某个动作或状态所持续的时间.how long在对句子中带有for或since等表示持续性的时间状语提问时,谓语动词不能是终止性动词.如:
—How long are you staying in New York?
—For two years.