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I have known him for five years.
B2Sentence
Narrator
I have known him for five years.
Study notes
How to use in different contexts
Giving Information
I've known him for five years.
Answering a Question
How long have you known him? I've known him for five years.
Starting a Story
I've known him for five years, and during that time...
Making a Comparison
I've known him for five years, while I've only known her for two.
Rephrased versions
Formal
I have been acquainted with him for a period of five years.
Informal
I've known him for five years now.
Simpler English
I know him; it's been five years.
Phrases to learn
have known him
To be familiar with someone for a specified duration.
for five years
Indicating a duration of time.