I believe the above answer is perfectly acceptable but NOT technically grammatically correct.;} I am also a native English speaker but I have studied many languages and can answer your first question more technically. It's a question of subject (who is doing the verb) vs the Direct Object(what the verb is happening to) I = Subject form He = subject form Me= Direct object form Him= Direct Object form In YOur Sentence: " We are going to have dinner, just me and him" --> We is the subject, because we are having dinner. He and I are also having diner. In this case, you have constructed a sentence where the ", he and I" at the end just is an extension of WE Example: Just He and I are going to go hunting ducks (HE and I are doing the verb, hunting) The ducks are going to hunt me and him (ME and HIM are acted on by the verb, Being Hunted) Why he made this mistake, and why you can too: As you can see from the example, usually the Direct Object is near the end of the sentence, while the subject is at the beginning. SO most English speakers will just assume that anything coming at the end of the sentence is a "me/him" construction.

1) We are going to have dinner, just he/him and I" 2) They both make sense :)

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1) Do you say "We are going to have dinner, just me and him" or "Just me and he" or "Just he and I"? Which one is right? Just me and him in this case. If you constructed the sentence differently, it could be different. For instance "He and I will be having dinner together." But your construction would need "me and him". I can't explain it well, just know it from being a native speaker. 2) Are these two sentences odd? I moved out of my old house one year ago last week" "I started working here one month ago last Friday"? They would both be understood easily. A small change that could make it clearer might be "Last week made it one year since I moved out of my old house." "Last Friday made it one month since I've been working here."