Sentence with demonstrative without explicit subject - de required? I am unable to understand, whether the sentences below require the particle de? 


  Zhè ge hěn hào chī (literally "this piece of food delicious". I guess there is no "de" in the end, although it is an adjective in this sentence, modifying the measure word "ge"). 
  
  zhè zhī hēi de (This cat is black. For some reason, there is the "de" but I cannot see why).
  
  zhè Ben Shu hěn hào (This book is good. Here again, the "de" is missing. When I tried to verify with google translate, it used 是 but I guess that is not correct.)


So is it because those are one-syllable adjectives? I have heard that often in that case, the "de" particle is skipped.
这个很好吃。  


一般语气，可以不加'的'。
若要加强语气，加'的'，而且念重一点。


  这是黒的。
  这猫是黒色的。


通常要加'的'。


  这本书很好。


和第一例一様，平常可省略；加强语气时，加'的'。