Contents › Section 6: Bilingualism, language acquisition and language learning › answer 26 of 27
Will my child learn incorrect grammar from me?
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This depends. Your child can only learn what she gets from the input. So, if you consistently say 'goed' instead of 'went' or drop the third person singular endings on verbs ('she run'), that's what your daughter will learn to say.
However, no input is perfect (even from native speakers), so if you make some 'errors', your daughter is likely to make the correct generalizations anyway. But there are aspects of English usage/grammar - e.g. tenses or articles - where non-native input may result in acquiring non-standard usage patterns.
Of course, you are also unlikely to limit her input to just your speech. From very early on (18 months or so), it would make sense to start showing her English-language videos for children, so she should get sufficient input there, even if she's not exposed to other speakers in person.
But you should also be aware that this approach is not always successful. See this recent blog post looking at research on the topic: https://www.psychologytoday.com/blog/life-bilingual/201504/one-person-one-language-and-bilingual-children.
© Dominik Lukeš. Licensed under CC BY-SA 3.0. Originally published on Linguistics Stack Exchange, attributed there to Dominik Lukes (profile).