当然也可以用在将来时和过去时中.
不过要注意的是：如果句子不是否定句,则动词必须是延续性动词.
1.I‘m going to stay in Beijing for 3 days.
2.I'm going to travel in Beijing for 3 days.
3.I'm going to stay in Bejing on business for 3 days.
4.I traveled in Beijing for 3 days last week.
I stayed in Beijing on business for 3 days.
5.How many days did you travel in Beijing for last week?
How many days did you stay in Beijing on business for?
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