Pronunciation change

Verb change

Plain form
yawn

Third-person singular
yawns

Past tense
yawned

Past participle
yawned

Present participle
yawning

 
A person yawning
  1. When someone yawns, they open their mouth wide and sometimes stretch their arms.
    I can see that you're tired, because you keep yawning.

Noun change

Singular
yawn

Plural
yawns

  1. A yawn is the action of yawning.
    He did three big yawns, then stood up to go upstairs to bed.