Present perfect with since and forWe use the Present perfect+since/for talk about how long present situations have lasted.• Since is used when we are talking about something that started at a particular point of time in the past. We have known each other since 1990.• For is used when we are talking about a period of time. We have known each other for 16 years.
• She’s been married for 4 years.• They’ve known each other since last April.
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