Hi Dorabelle
The following recommendations have been emphasized in the literature related to raising bilingual children:
\tRespect the decision of the child to speak in another language.
\tHave patience with your child, remembering that he is still developing his language skills in a passive manner.
\tConvey the idea that learning Chinese can be fun through the use of books, magazines, film, songs and games.
\tPlan activities that reinforce the learning process such as cooking, outings at the zoo, or an afternoon at the museum.
\tTake interest in what a child is saying, listen attentively when he communicates his feelings and desires.
\tCongratulate your child on progress made and motivate him by praising his advances and show pride when he responds in Chinese.
\tFormulate questions with greater complexity so as to avoid a simple yes or no response, for example, “Would you like me to give you a blue wagon or a green ball?
\tFormulate questions which necessitate a complex and varied response.
\tTravel to the country where the corresponding language is spoken so as to stimulate the child’s development in the language.
\tCultivate and maintain contact to relatives that only speak the child’s secondary language (Chinese).
\tCreate contacts to other children being raised bilingually, with Chinese as mother tongue.
VivaLing, the world's first online language Academy, can also be of help with your daughter as we are used to teaching Chinese in a very kids-friendly and funny way, focusing on oral skills, to children aged 3 and above.
We hope this will help! Good luck 
V
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RE: How to improve chinese of a preschooler
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RE: New ! 2015 Primary School Mother Tongue Languages Curriculum
Hi, Just to let you know, VivaLing is proposing a new approach to Chinese learning, more focused on oral and comprehension skills, still being on line with MOE syllabus. If you want to try something different from the classical tuition center, please have a look at our website: http://www.vivaling.com. We will be happy to let you try one lesson for free - so you can check if it is worth for your kids.