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Howsoon和howlong的含义和用法不同。how soon意为“还要多久”，是对从某个基本时间到将来某动作结束或某动作发生这段时间提问，常用在一般将来时态的句子中。how long意为“多久、多长时间”，可用于各种时态。
How long have you been in your present job?
你干现在这工作多长时间了？
Time how long it takes you to answer the questions.
记一下自己回答这些问题所需的时间。
How long has he been in office?
他任职多久了？
How soon can you come up with the money?
你什么时候能拿出这笔钱？
How soon would you like to have them done?
你要我多久把这些做好？
How soon after the tests will I learn the results?
我能在检查多久之后知道检查结果？