Form and use plurals of compound nouns

πŸ‘‰ A compound noun is made up of two or more words that together act as a single noun.
Examples: 🚌 school bus, πŸ–ŠοΈ mother-in-law, πŸƒ runner-up


1️⃣ Add -s to the main word (the most important part):

  • brother-in-law πŸ‘‰ brothers-in-law πŸ‘¨β€πŸ‘¨β€πŸ‘¦
  • passer-by πŸ‘‰ passers-by 🚢

2️⃣ Add -s to the last word (if it’s the main part):

  • school bus πŸ‘‰ school buses 🚌
  • textbook πŸ‘‰ textbooks πŸ“š

3️⃣ If the compound is written as one word:

  • toothbrush πŸ‘‰ toothbrushes πŸͺ₯
  • sunflower πŸ‘‰ sunflowers 🌻

4️⃣ If the compound noun has no main word (or is hard to identify):

  • forget-me-not πŸ‘‰ forget-me-nots 🌸
  • merry-go-round πŸ‘‰ merry-go-rounds 🎠

βœ… daughter-in-law πŸ‘‰ daughters-in-law πŸ‘©β€πŸ‘§
βœ… man-of-war πŸ‘‰ men-of-war βš“
βœ… keyboard πŸ‘‰ keyboards ⌨️
βœ… washing machine πŸ‘‰ washing machines 🧺


✨ Always check which word carries the main meaning.
✨ Add -s/-es only to the important part of the compound.
✨ Memorize irregular ones (man-of-war β†’ men-of-war).


πŸ‘‰ Turn these into plurals:

  1. passer-by 🚢
  2. mother-in-law πŸ‘©β€πŸ‘©β€πŸ‘¦
  3. textbook πŸ“š
  4. son-in-law πŸ‘¨β€πŸ‘©β€πŸ‘¦
  5. merry-go-round πŸŽ