1. Science that studies language and manifestations of human speech
1.1. Language is made of linguistic signs
1.1.1. Signifier
1.1.2. Signified
1.2. Design features
1.2.1. Arbitrariness
1.2.2. Duality
2. Subfields
2.1. Study language from diferent perspectives
2.1.1. Semantic
2.1.1.1. Meaning of words,phrases or sentences
2.1.2. Pragmatics
2.1.2.1. Speech acts and language usage
2.1.3. Discourse analysis
2.1.3.1. Text structure and function of text and conversation.
2.1.4. Linguistic typology
2.1.4.1. Diversity in the languages of the world
2.1.5. Psycholinguistics
2.1.5.1. Study of language processing in the brain.
2.1.6. Cognitive Linguistics
2.1.6.1. Interrelation between language and thought.
2.1.7. Computational Linguistics
2.1.7.1. Statistical and logical modeling of natural language from a computational perspective.
2.1.8. Sociolinguistics
2.1.8.1. Interrelation between language and society.
3. Has 2 approaches to study language
3.1. Synchronics
3.1.1. studies language at a certain time
3.2. Diachronics
3.2.1. language changes over time
4. Language Functions
4.1. Interpersonal function
4.2. Ideational function
5. Systemic Properties
5.1. Phonetic
5.1.1. speech sounds.
5.2. Phonology
5.2.1. sound systems.
5.3. Morphology
5.3.1. word structure.
5.4. Syntax
5.4.1. sentence structure.