Could you say how long David has:

1) lived here?
— for 5 years
— for 3 months
— since 1988
— since Monday

2) been here?
— for 3 days
— for a week
— since May
— since Tuesday

3) known them?
— for 3 years
—for 2 weeks
— since 1991
— since last Friday

4) had them?
— for 2 days
— for a month
— for ten years
— for years

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