What are the 7 functions of language?

Language performs a number of functions based on the purpose of its use. 7 of its functions are listed below:
1. Instrumental:
The way an individual satisfies the need by asking for something (May I take your pen?).
2. Regulatory:
Controlling another’s behaviour (e.g. teacher asks the student “sit quiet, please”).
3. Interactional:
Used for maintaining interpersonal (e.g. wishing a friend a happy birthday).
4. Personal:
Where one talks about oneself (e.g. I am feeling very depressed today)
5. Heuristic:
To find out about the world in general (e.g. Is there any drug to cure AIDS?)
6. Imaginative:
Where one talks about one’s imagination (e.g. write an essay on the topic “You are on the clouds”).
7. Informational:
To seek and give varied types of information (e.g. What is the current rate of population growth in over country?).