Hi again, when you learn a language you need to learn entire phrases such as collocations, idioms and sentences instead of isolated words. It’s impossible to learn all the meanings of a preposition by just reading the definition of that preposition.
Instead, you should try to make sense of the entire phrase:
to do something with somebody
Or even better, look the entire phrase up in the National Corpus and/or on Google and see in what contexts it is used.
Please let me know if this makes sense.
PS: You post your reply just by hitting the blue ‘Reply’ button as you have done before.