1. The document discusses mother tongue-based multilingual education (MTB-MLE), including its benefits like developing cultural identity and facilitating learning other languages. It also covers challenges like lack of teaching resources and issues deciding which language(s) to use for instruction.
2. The Sapir-Whorf hypothesis proposes that language shapes thought and influences how people perceive reality. It is discussed along with its proponents Edward Sapir and Benjamin Lee Whorf. Examples of how language can influence perception of concepts like time, color, and gender are provided.
3. Criticisms of the Sapir-Whorf hypothesis are presented, such as that it fails to consider contextual language use and may not apply universally