In which case would the use of informal syntax be more appropriate than a formal syntax?

The use of informal syntax is best suited for use with family, friends and relaxed situations where formality is not required.

Explanation:

Syntax is the part of grammar that studies the arrangement of words in periods, as well as the logical relationship between them. It is the set of rules that determine the different possibilities of associating the words of the language for the formation of statements. All languages, besides having a lexicon composed of thousands of words, also have some rules that determine how words can combine to form utterances. These rules are what define the syntax.

Formal syntax is one that enables the use of refined and elegant words. This type of sentence is used in formal situations, such as presenting an academic paper, or communicating with a superior. Informal syntax is one that allows the use of colloquial and casual words, slang and words with little elegance; This type of syntax is ideal for use with friends or in relaxed situations.

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