【正确答案】：
COMPOUNDS DIFFER FROM FREE PHRASES IN THE FOLLOWING THREE ASPECTS.
（1）PHONETIC FEATURE—STRESS PATTERN. IN A COMPOUND, THE STRESS USUALLY FALLS ON THE FIRST ELEMENT WHEREAS IN A FREE PHRASE THE STRESS OCCURS ON THE SECOND ELEMENT, E. G. GREEN HAND/'GRI：NHæND/(COMPOUND) ./GRI:N‘HæD/(FREE PHRASE).
（2）SEMANTIC FEATURE. THE MEANING OF A COMPOUND IS GENERALLY DIFFERENT FROM THE COMBINATION OF THE TWO ELEMENTS WHEREAS THAT OF A FREE PHRASE IS NOT，E. G. “RED TAPE” AS A COMPOUND MEANS “BUREAUCRACY”, BUT AS A FREE PHRASE IT MEANS “A TAPE THAT IS RED IN COLOUR”.
（3）GRAMMATICAL FEATURE. EACH COMPOUND IS A GRAMMATICAL UNIT WHICH IS INSEPARABLE, SO GENERALLY NO CHANGES SHOULD OCCUR WITHIN IT, E. G. “FINE ART” CANNOT BE CHANGED INTO “FINER ARTS”. 
【题目解析】：复合词与自由短语的区别体现在以下三个方面。（1）语音特点——重音：复合词中的重音通常在第一个构词成分上，而在名词词组中重音一般在第二个词上。例如：green hand（生手）/'gri：nhænd/( 复合词中 compound) ./gri:n‘hæd/(自由词组中 free phrase)。（2）语义特点：复合词的意义一般不同于这两种成分的组合，而自由短语的意义则不同。例如：“red tape” 作为复合词意味着 “bureaucracy（官僚主义）”, 但是在自由词组中它表示 “a tape that is red in colour（红色的带子）”。（3）语法特点：每个复合词都是一个不可分割的语法单元，所以一般来说，它内部不应该发生任何变化，例如：“fine art（精细工艺）”不能变成 “finer arts（美好的艺术）”。