Analyze and comment on the following.He is as poor as a church m

Analyze and comment on the following.He is as poor as a church mouse. Pick out the idiom in this sentence, then point out its structure, grammatical function and figure of speech.
【正确答案】：

(L)THE IDIOM IS “AS POOR AS A CHURCH MOUSE”.
(2)ITS STRUCTURE IS : AS+ADJ.十AS+N.
(3)ITS GRAMMATICAL FUNCTION： ADJECTIVE IDIOM AS PREDICATIVE IN THIS SENTENCE.

(4)SIMILE. 

【题目解析】：(l)The idiom is “as poor as a church mouse”. (2)Its structure is : as+adj.+as+n. (3)Its grammatical function： adjective idiom as predicative in this sentence. (4)Simile.