[masaegu]

Originally Posted by bonty

みんなさん　こんばんわ

みんなさん　　＞＞　みなさん
こんばんわ　　＞＞　こんばんは

We say みんな, but never みんなさん.

The last syllable in 'konbanwa' is written as は. In case you didn't know, it's the particle 'は'.