虽然…但是
Curiosity
You want to link two sentences logically, as in "although it was cold, he came." Where does Chinese place the connectors?
Intuition
Chinese connectives often move in pairs: one at the head of the first clause, one at the head of the second. Two flags mark the start of each clause, making the relation (concession, cause, escalation, condition) explicit.
Visualization
Add the connective pair to the two clauses [cold][he came] → [suiran][cold][danshi][he came]. suiran goes before the first clause, danshi before the second.
Essence
Key pairs: suiran...danshi (concession), yinwei...suoyi (cause/result), budan...erqie (escalation), ruguo...jiu (condition), zhiyao...jiu (sufficient condition), jishi...ye (concessive hypothesis). The first connective can often be dropped, but the danshi/suoyi/jiu of the second clause is usually kept.
Examples
Mini-quiz
Which cause-result pair fits "because it rained, (so) we did not go"?