Well , there are 2 different kinds of learners. There are those who need grammar and those who do not. I can remember vocabulary but never remembered the grammar of the 4 languages I learnt over the years.
To use a language efficiently and proficiently, you need to know all the grammar. Regardless if you have learned them systematically or if you have deciphered them by yourself. The latter might be somewhat easier if the foreign language is close to your own language, which means you already got that information. I've found Indoeuropean languages much easier to learn than others.
Sometimes even the definition of "grammar" is confusing. If you study Indoeuropean languages, they are so similar that "studying" grammar is mostly getting the conjugation and declination right. Sometimes you only have to switch some endings between languages. With other languages, the entire system of morphology is different, because for example they have more "persons" or whatever.
Additionally, English or Chinese may seem to have easier grammar, but then the complexity is hidden in the vocabulary or usage patterns.
bayesian_horse|6 years ago
Sometimes even the definition of "grammar" is confusing. If you study Indoeuropean languages, they are so similar that "studying" grammar is mostly getting the conjugation and declination right. Sometimes you only have to switch some endings between languages. With other languages, the entire system of morphology is different, because for example they have more "persons" or whatever.
Additionally, English or Chinese may seem to have easier grammar, but then the complexity is hidden in the vocabulary or usage patterns.