It's because the meanings in the adverbs and the prepositions ordinarily stay the same in these phrasal verbs. For illustration, the that means of “up” in Pretty much all phrasal verbs is connected with ending or finishing some thing. Phrasal verbs are frequently very difficult for English learners. In https://learnsimplepresenttense04691.blogunok.com/32652930/top-latest-five-englishgrammar-urban-news