کلمه ی sadness در حالت های noun /verb /adj /adv

.Sad =  adjective

They got sad.

.Sadden =verb

His face saddened  when he heard the news.

.Sadness=noun

Sadness can ruin your day.

.Sadly=adverb

During her presentation she spoke sadly.

سلام

اسم: sadness

صفت: sad

قید: sadly

فعل: make sad یا become sad . به تنهایی بعنوان فعل بکار نمی رود