 For the most part, they need not reconceptualise their world in the new language.The path breaking power of L1 grammar is not dependent on the fact that both languages share similar grammatical features.It is because all languages have evolved means of expressing abstract ideas such as possession, number, agent, instrument, negation, cause, condition, obligation etc., no matter how they do this, that one natural language is enough to open the door for the grammars of other languages.