Sie sind der beste Lehrer den es gibt!
This is also an effective way to express gratitude to your instructor with a compliment. It could only brighten their day! In Germany, where time management and regularity are important in both traditions and culture, expressing courtesy is particularly important.
Ich Danke Ihnen.
Professionally, it’s essential to use the formal Sie and Ihnen forms of address. This is particularly important if you don’t know the individual, in business situations, or in any other situation where you need more distance. Having to meet a teacher, an employee, or in a work meeting is a good example. A simple thank you is not acceptable in these circumstances; nevertheless, to use the structured Ich danke Ihnen is more popular and acceptable. Let’s take a look at that one again. The first letter, Ich, means “I” in German. Then there’s danke, and then there’s Ihnen, which would be the formal form of the English word “you.” Ich danke Ihnen, to study the phase angle of “thank you.” These are significant words.