Diphtong /oi/ and /ou/

Diphtong /oi/ and /ou/

Some English words, such as boil and round, have two sounds in one syllable that are pronounced together. Pay attention to how your mouth forms the two sounds. Together the two sounds form a vowel sound called a diphthong.

/oi/ and /ou/

In the word boil, the letters oi stand for

the diphthong /oi/.

In the word round, the letters ou stand for the diphthong /ou/

/oi/ sound

Note that the sound /oi/ can be spelled in two different ways:

/oi/ as in coin

and

/oi/ as in boy

/ou/ sound

Note that the sound /ou/ can be spelled in two different ways:

/ou as in ground

and

/ou/ as in how

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