List 1 - Singular and Plural Nouns

By adding –s if there is a vowel before the -y

 

 

 

Singular  Plural    Singular  Plural 
alloy alloys   joy joys
bay bays   key keys
boy boys   kidney kidneys
chimney chimneys   monkey monkeys
day days   play plays
decoy decoys   ray rays
delay delays   toy toys
donkey donkeys   tray trays
guy guys   trolley trolleys
jersey jerseys   valley valleys
journey journeys   way ways

 

 

The ending –is is changed to –es

 

 

Singular  Plural 
analysis analyses
axis axes
basis bases
crisis crises
diagnosis diagnoses
ellipsis ellipses
hypothesis hypotheses
oasis oases
parenthesis parentheses
thesis theses

 

  1. By changing –y into –ies if a noun ends in a consonant before the -y.
  2. By adding –s or –es to nouns ending in -o
  3. By adding –es to nouns ending in -o.
  4. By adding –s to nouns ending in -o.
  5. By adding -es to nouns ending in –ch, -s, -sh, -ss, -x, and -z.
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