When talking with someone about seeing someone recently, and about a specific place. I saw him around here. I saw him around here just before. When I was here yesterday, I saw him around here. This could also be a memory from a more distant past. Twenty years ago when I lived in this area, I used to see him in the park. I saw him around here (pointing to a specific place, showing someone). When talking about someone, and seeing them around a general area. I've seen him around here. I've seen him around here before. (better because you use I have (past tense)). It could be that right now, you can see him, and you are saying, "I've seen him around here before. I saw him around here yesterday/last week". Past tense, but no longer the case. I'd seen him around before-is not a complete expression. I had seen him around here before, but recently I have not seen him again. I had (past tense) seen (past tense) together means that in the past you have seen him, but now more recently you have not seen him any more.. These three depend a lot on the conversation leading up to the statement. I hope this helps

Hi Pelin! All three of these are actually correct. Your choice will depend on the meaning you are trying to convey. 1) "I saw him around." [IMPERFECT] This sentence conveys the notion that, in the past, you saw this person with some frequency (habitual action); this is indicated through the word "around." Example sentence: "Mark studied at university with me and I saw him around campus very frequently." 2) "I've seen him around." [PRESENT PERFECT] The construction TO HAVE (present) + past participle (i.e., in this sentence, "I have seen...") indicates that this event happened in the recent past. Example sentence: "John is definitely here at work today; I've seen him around the office a few times." 3) "I'd seen him around." [PLUPERFECT] The construction TO HAVE (past) + past participle (i.e., in this sentence, "I had seen...") indicates that this event happened in the past prior to some other event. Example sentence: "George used to have a membership to the gym. I had seen him around many times until his membership expired." I hope this helps! I could share with you some comparative examples in Turkish if it helps further. Good luck! Jacques

The second one

we use the past simple (saw) for events in the past ....and the past perfect (had seen) for events further in the past... Present perfect ( have seen) is used for events that began at an unspecified point in the past. You may or may not know whether it's still happening or not. It usually has relevance to the present.