Talking about a person who's just died, which if these can I use?
Have you known him for a long time?
Did you knew him for a long time?
How long have you known him?
How long did you know him?
How long you knew him?
anonymous which of these can I use? These: Have you known him for a long time? Did you know him for a long time?
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anonymous which of these can I use?
These:
Have you known him for a long time?
Did you know him for a long time?
How long have you known him?
How long did you know him?