that would/will never dospokenBAD used to say that you would not want something to happen 那绝对不行 Someone might discover our secret and that would never do. 也许会有人发现我们的秘密,那可绝对不行。
that would/will never do• Bless my best boots, that would never do at all.• Oh, no, that would never do, would it?
→ that would/will never do at never(4)