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Diphthongs Worksheet (Grade 1)

Free printable diphthongs worksheet for Grade 1. Students fill in ou, ow, oi, and oy gliding vowel sounds in words like cloud and toy.

Name: ______________________Date: ____________
Phonics · Grade 1

Diphthongs

Some vowel pairs make a gliding sound (cloud, cow, coin, toy). Fill in the missing diphthong.

  1. 1.
    Fill in ou, ow, oi, or oy: m__th (mouth)
    • a) ou
    • b) ow
    • c) oi
    • d) oy
  2. 2.
    Fill in ou, ow, oi, or oy: c__n (coin)
    • a) ou
    • b) ow
    • c) oi
    • d) oy
  3. 3.
    Fill in ou, ow, oi, or oy: __l (owl)
    • a) ou
    • b) ow
    • c) oi
    • d) oy
  4. 4.
    Fill in ou, ow, oi, or oy: p__nt (point)
    • a) ou
    • b) ow
    • c) oi
    • d) oy
  5. 5.
    Fill in ou, ow, oi, or oy: r__nd (round)
    • a) ou
    • b) ow
    • c) oi
    • d) oy
  6. 6.
    Fill in ou, ow, oi, or oy: s__l (soil)
    • a) ou
    • b) ow
    • c) oi
    • d) oy
  7. 7.
    Fill in ou, ow, oi, or oy: t__ (toy)
    • a) ou
    • b) ow
    • c) oi
    • d) oy
  8. 8.
    Fill in ou, ow, oi, or oy: b__l (boil)
    • a) ou
    • b) ow
    • c) oi
    • d) oy
  9. 9.
    Fill in ou, ow, oi, or oy: c__ (cow)
    • a) ou
    • b) ow
    • c) oi
    • d) oy
  10. 10.
    Fill in ou, ow, oi, or oy: b__ (boy)
    • a) ou
    • b) ow
    • c) oi
    • d) oy
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