>for an English speaker, there probably won't be any need to explicitly learn the grammar, since it works mostly like English //
For a period in the UK there was no English grammar taught in schools. This caused me great problems in Russian class (second high school language) as I had no idea there were cases in English and so had no reference for why a case was needed and what it did. The entirety of my English grammar training was learning a poem by rote for homework, which I didn't do ("A nouns the name of anything [...]"). I learnt the little grammar I know from French lessons. So, YMMV depending on the English speaker.
For a period in the UK there was no English grammar taught in schools. This caused me great problems in Russian class (second high school language) as I had no idea there were cases in English and so had no reference for why a case was needed and what it did. The entirety of my English grammar training was learning a poem by rote for homework, which I didn't do ("A nouns the name of anything [...]"). I learnt the little grammar I know from French lessons. So, YMMV depending on the English speaker.