Collaborate 4 unit 1 revision (edited)
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Correct the mistake - I know my best friend for a long time.
I HAVE KNOWN my best friend for a long time.
Correct the mistake - I have been writing three emails so far this morning.
I have WRITTEN three emails so far this morning.
I _______ this car since 2001. Time to buy a new one! (have)
I HAVE HAD this car since 2001. Time to buy a new one!
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