there is no plural for sheep 1 sheep is call a sheep and more than 1 sheep is call a sheep
Shelves
Mitochondria
Buffalos
cargoes or cargos
Children or kids
Crises -- pronounced krahy- - seez
The plural of activity of activities.
oxen - eg. a team of oxen pulled the plough
Successes is the plural form of the noun success.
phenomenons; for example, they were hit with many phenomenons. :) hope this helpss :D
The plural of calculus is generally "calculi." The word "calculuses" is also a plural, but very rare.