We had a parent-teacher meeting last month and the teacher suggested me to take my daughter to check with a speech and language pathologist since there are some words that she can¡Çt pronounce properly and her grammar is not good compare to other kids. So I did and the pathologist said that she¡Çs totally fine.
Sounds like your teacher is not really familiar with bilingual language development...
¡ä¡¡ENGLISH language on the other hand is the hardest language in the world
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Japanese language consists of lots of different characters that look like pictures so he is able to learn it easier
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Don¡Çt worry, obviously she has no idea what she¡Çs talking about. Espeically nowadays, how many people have been brought up with multiple languages. Although I dont have kids, I know that you are doing right thing to your child.