Just can have several meanings 1) something that happened very recently ex: I just now responded to this question. 2) only, or simply ex: I responded to this question just because I can see how this word is confusing ex: I just don't understand.

f. not involving anything more than the thing that you are mentioning We just wanted to make sure everyone was safe. In my opinion, the argument is just about money. No, I don’t want to buy anything. I’m just looking. g. exactly the right thing, place, or person Thank you so much. It was just what I wanted. just the thing/place/person etc.: It’s just the place for a picnic. h. used for emphasizing a statement (generally spoken, not written) It was just awful seeing her so miserable. I just can’t believe what’s happened. Just exactly what do these numbers represent? i. used for emphasis when you are telling someone to do something Now, just calm down and tell me what the problem is. Just look at that dress she’s wearing! j. used for saying that although something happens, it almost does not happen The four girls just managed to squeeze into the back of Rick’s car. We should just get there on time if we hurry. only just (=by a very small amount): He did pass his finals, but only just. k. SPOKEN used for making a request more polite Could I just borrow your pen for a second?

Here are the examples: a. soon, or at a particular time I can’t come now. I’m just putting the kids to bed. just now: We’re just now beginning to understand how much work this project will be. just then/at that moment: Just then a knock at the door interrupted our conversation. be just going/about to do something: Mark was just about to leave when someone called him. I was just going to ask you the same question. just when/as: Just when you think it’s all over, something else happens. b. short time ago, or a short time before something that happened in the past Mom just left to go to the grocery store. Andy had just arrived in Australia the day before. Susan was just telling me about your new job. only just (=a very short time ago): I’ve only just started, so I can’t tell you anything yet. c. used for emphasizing how recently something happened just yesterday/last week etc.: Just last week it was freezing, and now it’s too hot. d. Only not more than a particular amount, number, distance, etc. The medicine costs just a few cents to produce. He quit the project after just four months. There’s a little bookstore just around the corner. e. not better, worse, more important, etc. than what you are mentioning We’re just a small business with 15 employees. It was just a stupid mistake.

Just can be used for saying when something happens--I have broken it down into different ways below (a. b. c.) Just can be used in place of "only" (example d. below) Just can = not better, worse, more important, etc. than what you are mentioning (example e.) Just can be used for: not involving anything more than the thing that you are mentioning (example f.) Just can = exactly (example g.) Just can be used for emphasis (example h.) Just can be used for emphasis when telling someone to do something (example i.) Just can be used for saying that something almost did not happen (example j.) In speaking can be used to make a request more polite (example k)