Don Johnson

1 Cor 14 Chiasm
A 26 All believers can have a verbal contribution
B 27-28 Tongues – be silent if no interpreter
C 29-33a Prophesy – be silent if another speaks
D 33b-35 Legalists: “Women be silent”
D’ 36-38 Paul “Bunk! Women can speak”
C’ 39a Prophesy – desire to prophesy
B’ 39b Tongues – do not forbid
A 40 All things done decently and in order

By reverse engineering, one can hopefully see that the problem was chaos in the Corinthian church setting. Some legalists proposed doing what the synagogues did, namely keep women quiet, this reduces the potential speakers by half. Paul will have none of that, but he does give guidelines so things will be done in order.
The underlined be silent shows the same word being used in the Greek. The underlined all in the A-A’ shows the paired concept.