Plurals that change more than the ending

/tuːθ/noun

One of the hard white parts in your mouth.

One tooth has been hurting for days.

/tuːθ/noun

One of the hard white parts in your mouth.

The plural is teeth, on the same pattern as foot.

/mæn/noun

An adult male person.

The man at the desk helped me.

/mæn/noun

An adult male person.

The plural is men, and only the vowel moves.

/ˈpɜːrsən/noun

A human being.

Which person should I speak to?

/ˈpɜːrsən/noun

A human being.

The usual plural is people, a completely different word.

/maʊs/noun

A small grey animal, or the thing beside a keyboard.

There is a mouse behind the fridge.

/maʊs/noun

A small grey animal, or the thing beside a keyboard.

The plural is mice, which shares nothing with the singular vowel.

/laɪf/noun

The time somebody is alive.

Life here is slower than at home.

/laɪf/noun

The time somebody is alive.

The plural is lives, with a V and a shorter feel.

/liːf/noun

The flat green part of a plant.

A leaf had blocked the drain completely.

/liːf/noun

The flat green part of a plant.

The F becomes a V in the plural: leaves.

/tʃaɪld/noun

A young person.

Is there a menu for a child?

/tʃaɪld/noun

A young person.

The plural is children, with an extra syllable and a shorter vowel.

/naɪf/noun

A tool for cutting.

Could I have a clean knife please?

/naɪf/noun

A tool for cutting.

The K is silent, and the plural is knives with a V.

/ˈwʊmən/noun

An adult female person.

A woman outside was asking for you.

/ˈwʊmən/noun

An adult female person.

WU-man in the singular, WIM-en in the plural. Both vowels change.

/fʊt/noun

The part of the body you stand on.

My left foot is rather sore.

/fʊt/noun

The part of the body you stand on.

The plural is feet: the vowel changes, nothing is added.