English is taught as a second language and as a foreign language. For English teachers, it is essential to teach in such a manner that desired goals can be achieved. Therefore, a sound knowledge of the principles of teaching the English language is needed.

 Language teaching:  It is the process whereby a child gains communicative comprehension or fluency over a language. It involves practice by learners where facilitation is provided by a teacher. 

There are  Principles of Language Teaching which help to achieve the desired goals of Language Teaching.

• A language function refers to what students do with language as they engage with content and interact with others. 
• Here, the teacher relates language function with politeness and corrects the students by telling them the correct way of responding to the teacher or elder.
• Here politeness in the teacher can be seen from the substance of cooperative principles in the form of language function.
• The cooperative principle is a principle of conversation that will be helpful for the flexibility and accuracy of language communication.
• The teacher is using conversation as a medium to bring flexibility and fluency in the use of language by students i..e., by politely talking to them, making them hear new words, pronunciation, way of speaking, etc.

Thus, it is concluded that Here the teacher relates language function with politeness.