Answer:
I have three feet but I cannot walk. What am I?
If I drink I die. If I eat I am fine. What am I?
I am brown and sticky
What has one head one foot and four legs?
The letter S is added to pluralise most words in the English language. eg. Letter to Letters Word to Words and Language to Languages. But I am a word that is pluralised with the addition of the letter C.
No matter how little or how much you use me, you change me every month.