as in "I just arrived from school" or " Why do you always just arrive whenever shcool is done?"
Joyce arrived from school in the afternoon.
it's "He arrived early at school", although i think the other one is correct too
Usually, it is 'Just in time' and basically means, for example, that to get to a bus stop just as the bus appears in the distance, means that you have arrived at the bus stop 'just in time' to catch the bus.
'have arrived' or 'has arrived' I have arrived you have arrived (singular) he, she or it has arrived we have arrived you have arrived (plural) they have arrived Examples are: My parents have just arrived from Australia. Whoopee, they've arrived.
Sorry I have not just arrived and it is not clear what help you require.
arrived
They arrived in France by means of airplane.
'Llegaste' is the 2nd person singular informal preterit of llegar - to arrive. It means, "you arrived."
has arrived
disembarked
theyhad arrived just before the meeting started.