Spelling Rules -- Making Noun Plurals - Page 5
Rule 11: Of course you cannot make a plural of an uncountable noun. Some examples are:
1. information 2. blood 3. paint 4. harm 5. cattle
Rule 12: Some nouns by a quirk of fate exist only in the plural. Some examples are:      1. pajamas     2. scissors    3. spectacles
Rule 13: Some nouns by a quirk of fate exist only in pairs. Some examples are:       1. a pair of scissors     2. a pair of pants
Rule 14: Some nouns by a quirk of fate are the same for singular and plural. Some examples are:
1. deer 2. sheep 3. moose 4. fish
Rule 15: Some nouns by a quirk of fate appear as singular and plural but are actually separate words. Some examples are:
1. due - dues 2. pant - pants 3. spectacle - spectacles