Some doubts about "copulative sentences" in Chinese I'd like to know precisely how the Chinese language syntax conveys in the fewest possible number of words the meanings that English syntax expresses with simple copulative sentences.

For example, (1) can be used to respond to someone saying Jenny is behaving outrageously; it means that such behavior is ordinary behavior for her (i.e. Jenny is exhibiting the traits she always has had). (2) means exactly the opposite: she's now behaving out of the ordinary.


  (1) Jenny is Jenny
  
  (2) She's not being herself today


Sometimes in English we also identify participants of the conversation or its surroundings. For example, if we are talking with a friend about a couple of artists that he knows and, while we're talking, we happen to see people just like them in the street, we can point to them and utter (3). Moreover, if four kids are staging a play and deciding who plays who, one of them can utter (4).


  (3) Are they them?
  
  (4) He's me and she's you


Do these structures have equivalents in Chinese? I'm not interested in the translations per se; what I want to know is what syntactic structure is used to express sentences like (1)-(4).
The same structure exists in Chinese


  Jenny (is) Jenny --> 珍妮(就是)珍妮 
  
  Money (is) money --> 錢(就是)錢


~


  She's (not being/ not like) herself today --> 她今天(不是/ 不像是)她本人 
  
  Silver and coin (was not) the first currency  --> 錢銀(不是)最初的貨幣 
  
  This amount of money (is not/ is not counted as) money to me --> 這數目的錢對我來說(不是/不算是)錢


~


  (Are) they them? --> '他們' (是那個) '他們'嗎?
  
  (is) he him? -->'他'(是那個)'他'嗎?


~


  He (is) me (and) she (is) you -->'他'(就是)我(而)'她'(就是)妳
  
  Money is currency ; currency is money --> 錢(就是)貨幣；貨幣(就是)錢