Syntax in Language

Rules (Syntax) of Language (Generative Grammar):

By combining the words in specific ways, we can express meanings.

• A sentence ($S$) is made up of Noun Phrases ($NP$) and Verb Phrases ($VP$).
• $NP$s are made up of a determinant ($det$ or $D$) and noun ($N$), where $VP$s are made up (at least) of Verbs ($V$) and $NP$s.
• Prepositional Phrases ($PP$) are made up of Prepositions ($P$) and $NP$s
• These rules can scale up to googolplex amount of sentences. Occasionally, the words at the bottom (x2 and $rose$) are both called terminals. The internal nodes are called Non-terminals.
• The following is a Parse Tree or Syntax Tree

Note:

Can also work for programming languages, specifically, this refers to a Context-Free Language.