This question is about learning to speak a language as a mother tongue (i.e., from birth (L1), not as a second language (L2)).

Some languages have more grammar rules than others (number of cases, number of tenses, etc). Is there any evidence for or against the hypothesis that a more complicated grammar would make a language take longer to learn as a mother tongue (L1)? "Longer to learn" could manifest as delayed speaking or speaking more simply for a longer time.

In lieu of official studies, here is an observation... Let's take English language as a language with simple grammar, and Russian language as one with complex grammar. If we distinguish "spending more time to learn grammar" from "communicating complex ideas at a different age" then we can compare learning English and Russian by native children as following:

  1. Russian children spend more time in school learning grammar. Textbooks of Russian language contain many rules and exercises to learn proper writing; punctuation; cases; conjugations; negation of verbs, adverbs, adjectives; affect of prefixes on first letter of the root; alternation of vowels in a root; and many others. In order to learn the rules kids must be able to perform syntactical analysis of a sentence (subject, predicate verb, object, adverbial, grammatical modifier), morphological analysis of a word (prefixes, roots, suffixes, endings).
  2. English kids spend far less time focusing on grammar per se. Here is Ontario Curriculum. Compared to Russian curriculum it hardly contains any grammar.

However, if we look at what stories are read by kids of the same age from both backgrounds, we will find that they read books of the same complexity.

  1. They start with short stories when they learn to read at the age of 5-6.
  2. They progress to fairy tales at the age of 7-9, e.g. Grimm brothers, Hans Christian Andersen, etc.
  3. Then they move on to longer and advanced stories like Narnia, Hobbit, Harry Potter at the age 9-10 and above.

Conclusion: Children using a more complex language spend more time learning its grammar. However, it takes much longer for a child's brain to develop in order to understand and express more complex ideas than it takes to learn grammar.

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    Is the difference in time spent on grammar solely a consequence of differences in grammar? Or is it also a consequence of different views on language learning/teaching? – Christophe Strobbe Aug 7 at 21:36
  • @ChristopheStrobbe Russian teaching style is more formal indeed. However, for proper spelling and punctuation one must learn the rules. Strunk and White is 105 pages long. Russian authoritative reference on grammar and punctuation by D. Rosenthal is 704 pages. Students don't need to know all rules from that book, but they need somehow to learn and practice many of them. – Vitaly Aug 8 at 13:27
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    Strunk and White is hardly a grammar reference (and not a great book generally). I think you seriously underestimate the difficulty of English grammar, especially syntax. By the way, The Cambridge Grammar of the English Language has over 1800 pages. – Christophe Strobbe Aug 8 at 13:41

TL;DR It takes slightly longer.

You might want to check out It has useful information, such as the facts that 10-20 words can be taught. We all know that a child's brain development hasn't grown, yet it hinders their education, right?

Languages like Japanese for example have more grammatical aspects to it. It has polite and standard forms, and tenses based on animate and inanimate objects. Remember we're talking about someone's mother tongue! Children have absolutely no concepts of grammar when first learning it, they can't say "私 (watashi)" means I in English.

So, it's very obvious. Yes, you didn't want knowledge of things to do with second languages but here's one interesting thing. Now, the FSI (Foreign Service Institute) has Japanese as Category V (it means it takes about 2200 hours I think when I last checked), opposed to languages without rather complex grammar ideas.

There is likely going to be a psychological study, of course. However, it's common sense and checking out school curriculums are quite good.

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    There is a required source with the reference-request tag. Thus you can't say there's probably some sort of study (or other source), you need to use one – Anthony Pham Sep 11 at 11:26
  • @Anthony Pham I've included some references. This is not Wikipedia. Opinion should be accepted on a Q&A website. -.- – Steve Woods Sep 11 at 11:36
  • But it's not about children, it's applicable for any age group and for any languages. I think this answer is too narrow and maybe off topic as a whole. – Anthony Pham Sep 11 at 21:59

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