Subtitles section Play video Print subtitles Welcome to Day 4! You know, even if you studied a lot of grammar in the past, these videos can help you brush up on phrasal verbs. What does "brush up on" mean? It's like reviewing. Reviewing to get good at something again. Look at the examples. "Brush up on" is transitive. It takes an object. But it cannot be separated by the object. Brush up on WHAT? Is there something you once knew or did very well? Could you brush up on it within a month's time? Let's review the four phrasal verbs we've studied so far. We'll use flashcards. What does "let in on" mean? Do you recall the definition? How about "come up with"? Do you remember what "sink in" means? How about "brush up on"? Now let's shuffle the cards around and go the other way. Recall the phrasal verb. To gradually be understood = ? Which verb is that? How about "to practice an old skill"? "To produce or create." "To get an idea for something." Finally... "To share a secret..." "or allow someone to participate in something..." "not everyone can" You can create your own flashcards and do similar practice exercises.