However, forming plurals can prove a dangerous task, so you'd better take this quiz to check your knowledge. If you do well, don't bother reading the rest of this post. If you don't, I recommend revising your grammar.
For those how didn't do well in the quiz, I believe you'll find the following rules quite interesting and helpful!
These are some of the uncountable nouns:
These nouns 1) can not be used in plural
2) are followed by singular verbs (is, not are)
3) to count them, we use "some, any, little" etc
Same singular and plural
Nouns ending in -f or -fe form the plural with -s
But, nouns ending in -f or -fe form the plural with -ves
Nouns ending in -o form the plural with -s
OR with -es
Words with greek origin such as crisis, emphasis, praxis form the plural in -es (emphases, crises etc.)
Words with latin origin such as phenomena, criterion, larva, form the plural according to latin grammar: