ครู Kruu is a teacher who gives students knowledge and good manners.
อาจารย์ Aajaan is a teacher who gives students knowledge and good manners and also called someone who be a professional or expert in some technical knowledge, academic or even magic and also called a Master or holy Monks and Fortune teller..
Question2 : How different between ฉัน (Chan) and ดิฉัน ( Dichan )
ฉัน"Chan" means "I" usually use for female in common use but if makes it more polite or formal use ดิฉัน "Dichan"
Q: How do we use when in each context?
Q: How do we use "Speak, Talk and Tell?