‘-기 때문에’ is used with a verb showing a reason. It’s often used in a written form rather than in spoken language. It cannot be used in an imperative nor in a propositive sentence. It can be used with a noun like ‘N 때문에‘, And it can be used with a past tense.
● 한국 음식을 좋아하기 때문에 자주 먹습니다. (Because I like Korean food, I often eat Korean food.)
● 눈 때문에 학교에 못 갑니다. (Because of snow, I cannot go to school.)