connective N3 common casualpolitewritten
〜てはいけないから — because you must not ~ (so...)
〜てはいけないから ・ てはいけないから
Builds on て形
Meaning
- because you must not ~ (so ...) — just the prohibition てはいけない followed by the reason particle から
Key sentence
遅刻してはいけないから、早く家を出た。
Since I mustn't be late, I left home early.
Easily confused with
See 〜てはいけないから in real sentences
Jengo shows 〜てはいけないから the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.
Study it in JengoSources Compiled from published Japanese grammar references. Editorial confidence: medium.