Sentence

暑中お見舞い申し上げます。

暑中(しょちゅう)見舞(みま)(もう)()げます。
How are you getting along in this hot weather?
Sentence

暑中見舞いをみんなに書いた。

暑中(しょちゅう)見舞(みま)いをみんなに()いた。
I wrote to everybody inquiring after their health in the hot season.