The word "oil" does not contain the sound /ai/.
Explanation: The sound /ai/ is typically heard in words like "rain," "pain," or "main," where the vowel sound is a long "a" (as in "eye"). However, in the word "oil," the vowel sound is a diphthong, pronounced like /ɔɪ/, as in "boy," which is different from the /ai/ sound.
