Here are some of the rules of syntax:
* Word order: The order in which words appear in a sentence is determined by the rules of syntax. In English, the subject of a sentence typically comes before the verb, and the object of a sentence typically comes after the verb.
* Inflection: Inflection is the addition of suffixes or prefixes to words to change their grammatical meaning. For example, the suffix "-ed" can be added to a verb to make it past tense (e.g. "run", "ran").
* Grammatical agreement: Grammatical agreement is the requirement that certain words in a sentence match each other in terms of number, gender, and case. For example, the subject and verb of a sentence must agree in number (e.g. "The boy eats", "The boys eat").
The rules of syntax are essential for communication in any language. They provide a framework for expressing ideas clearly and effectively and helps avoid confusion. Syntax also plays a role in how a language sounds. Different languages have different syntactic rules, which can cause their speech to sound very different from each other.