Common Mistakes : Congratulation
noun
.BAD: Congratulation! You must be feeling very proud
.GOOD: Congratulations! You must be feeling very proud
: Congratulations is a plural noun
.Many congratulations to you both. I’m sure you’ll be very happy together
.Give them our congratulations and say that we’ll be getting in touch soon
.BAD: Congratulations for your splendid examination results
.GOOD: Congratulations on your splendid examination results
: (congratulations on (doing ) sth (NOT for
.Congratulations on your promotion. You certainly deserve it