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Spelling of Words in the Present Simple

How to add -s to the infinitive in the Present Simple

You must be careful with some words when using the 3rd person singular.

1. verbs ending in a sibilant [s] [z] [ʃ] [ʒ] [ʧ] [ʤ] or verbs ending in -o preceded by a consonant

We add es to the infinitive.

  • I search → he searches
  • I kiss → he kisses
  • I go → he goes
  • I do → he does

2. verbs ending in -y

Mind the letter that stands before -y.

Vowel before -y: Add -s.

  • I say → he says

Consonant before -y: Change -y to -i. Then add -es.

  • I worry → he worries