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I have to correct the sentence: I haven't seen Peter since he begins seeing his new girlfriend.
The correct answer is: I haven't seen Peter since he began seeing his new girlfriend.
I thought I could use the present perfect in the since clause because is a fact that initiates in the past and continues in the present.
Could I use "I haven't seen Peter since he has begun seeing his new girlfriend" ?
You don't use the present perfect tense with time expressions, which place the action at a definite time in the past.
I haven't seen Peter since he began seeing his new girlfriend.
The beginning of the relationship happened at a certain time in the past and not over a period of time.
I haven't seen Peter since he has been dating XY.
Here you are describing a duration. - They started dating at some time in the past and are still dating now.
