几个英语语言学考研问题,请根据语言学依据用英语帮助俺回答

题目

几个英语语言学考研问题,请根据语言学依据用英语帮助俺回答
1.what are the distinctive features?For eg.
2.it is said that there are infinite number of speech sounds in any languang,why?
3.why we can make dictionary of words of a language but not a dictionary of sentences?

答案

1distinctive features are features that help distinguish speech sounds.for instance,the voice [b] has distinctive features such as voiced and unaspirated.the former helps dintinguish [b] from [p],and ...