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第二十七单元 如何用因果法推展篇章 27.1 Cause and Effect(因果法) The stating of facts and the giving of reasons to explain why and how the facts came about is the basic procedure in essay development by cause and effect.The technique of cause and effect has great flexibility，for the relationships between causes and effects are not always as clear cut as the two terms seem to suggest.Causes may not all carry the same weight，for example.Several contributing causes may be grounded together to form one important cause.There may be one effect to a cause，or there may be many.Effects may be less important than causes，and so on.So you have to be very careful in dealing with cause and effect. Model Essay 27-1 As it is known to everyone，languages are constantly changing nowadays.There are many reasons why languages change，but the following three major causes may help illustrate the concept.Initially，various languages that started from the same parent developed their own uniqueness after groups of speakers drifted away from one another to establish isolated，independent communities. Another major cause of language change is the influence of and interaction with foreign cultures，often as a result of militaryconquest.A continuing cause for change is rapidly expanding technology and new systems of communication that bring all cultures and languages into closer contact，with borrowing between language a common phenomenon in the contemporary world. | 
