According to Paul Noble it is possible to speak Mandarin in two days. his course is entirely different from the system that schools use. Noble's method seems to be quite simple and is a lexixal approach, which means that a small selection of phrases, like chunks, are a lot more effective than learning long lists of words. Especially standard sets of words are more effective when you go to a restaurant, or to tell what I, he, she or it did. The main idea of this different approach in a language is to use verbs in a present or past tense. Noble thinks that is the best way to make things clear to natives, and to use these in all kinds of different sentences without a lot of trouble.
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Comment:
I think this way of learning a language can be effective, but I don't think you are able to speak Mandarin within two days using this way. I think learning parts of important sentences are more effective than learning lists of words, even though some words can be quite important. I just think that a combination of most used sentences + words are a must, instead of learning words how to say you're cleaning the floor because someone puked over there.
http://www.guardian.co.uk/education/2011/may/18/speak-mandarin-in-two-days