I also agree that pronunciation matters but is not that important.

A familiarity with the language will give the child a head start in school, and give them condidence.

Issues of pronunciation and grammar can/will be corrected by teachers later. This is also true for native speakers. Hence we have sayings like, 'do not write in the same way that you speak', or as one Indian teacher said to her students, 'Speak the Queen's English and not the President's English'. We all learn very quickly the different standards of any language that fit different environs. The language of the school yard is not the language for the classroom. Or where I came from, the language of the butcher's shop was not the language for Church, and vice versa.

psssst... confidence has only one d..

pssst... and it has an f

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hello, dear friends. thank you all for your great answers. I'm sorry for answering late for I was in hospital recently. all your answers helped me a lot! Thank you!

@xiashengli In your title thread you asked: "Is come upstairs a fixed match?" We don't say: 'fixed match'. What you were asking was: Is 'come upstairs' a fixed phrase.

@Liumingke1234, thank you very much. fixed match is translated directly from chinese,

it's also my translation. thank you for correcting it!