Thank you, David, for welcoming me back to the forum. I've been looking for a similar grammar discussion group all these years, but found none. I mean "none". I tell the world you are the greatest.
Anyway, I am fully satisfied with your answer to my "look at , look up " question. Espeecially the part where you said "The best way to learn phrasal verbs is simply by reading and listening to English as much as possible. This is what I've been doing as a non- native English learner. I just wondered there might be a simpler rule that I just haven't known. Thank you. MT