Please teach me the expression "for sure".
When you want to express that something is certain or definite, you can use the informal expression "for sure." It means something similar to "certainly" or "definitely." You can also use "for sure" to express enthusiastic agreement to a suggestion or question. Ex: It's going to rain tomorrow for sure. (Definitely) Ex: I know for sure why my friend is mad. Ex: A: Do you want to have dinner together tomorrow? B: For sure!