> "carry out" vs "you must do": the first form only implies who does what. The second form spells out exactly who does what. It goes beyond that. "Carry out" i

> "carry out" vs "you must do": the first form only implies who does what. The second form spells out exactly who does what. It goes beyond that. "Carry out" is an idiom the reader may not be familiar with. It may confuse them because they don't know what is the concrete thing they are supposed to be carrying, and where the "out" is located in this context. Verb + direction idioms are one of the most difficult parts of English as a foreign language. The direction often changes the meaning of the verb in an arbitrary way, and even the direction itself is often arbitrary.