because although so however: connect your ideas
先写下记得的内容，再查看解释。不要填写个人信息。
查看解释
Because introduces the reason or cause of an action. So introduces the result or consequence that follows an action. Although introduces an unexpected contrast or concession. But joins two opposing ideas within a single sentence. However is a transition adverb that indicates contrast across two complete clauses and requires stronger punctuation than a coordinating conjunction.
Maya brought an umbrella because dark clouds gathered over the hills.