Come up with something!

An American student asked a group of Japanese business students, "You need to come up with an idea. Did you come up with one?" We use so many phrasal verbs in English, those verb and preposition combinations with linking and stress on the prepositions. The next day, I showed them a site I'd copied onto Blackboard of the 25 most common phrasal verbs in English. Their writing teaching had them write (or come up with) dialogues, which they performed. After I taught "come up with", they all started using it. I also noticed that other native speakers used it with them all the time. Let me know if you can come up with other ways to teach phrasal verbs.