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# 7.7: The Diphthong [oi]

Difficulty Level: At Grade Created by: CK-12

## The Diphthong [oi]

1. You can hear the diphthong [oi] in spoil and joy. It sounds like a short <o> run together with a short <i>\begin{align*}<\text{i}>\end{align*}. The sound [oi] is spelled either <oi> or <oy>. Underline the letters that spell [oi] in each of the following words:

enjoyjoysoiltoyingmoistenpointedboilcointoiletroyalvoyagevoicesoiledloyaltypoisondestroy\begin{align*}&\text{enjoy} && \text{moisten} && \text{toilet} && \text{soiled}\\ &\text{joys} && \text{pointed} && \text{royal} && \text{loyalty}\\ &\text{oil} && \text{boil} && \text{voyage} && \text{poison}\\ &\text{toying} && \text{coin} && \text{voice} && \text{destroy}\end{align*}

2. Sort the sixteen words into these two groups:

Words in which [oi] is spelled . . .

3. Here are some words that contain the diphthong [oi]. They have been analyzed into their elements. Look at each carefully and notice whether the [oi] sound is at the front, in the middle, or at the end of its element:

en+joy+mentjoy+ful+lyboilboy+'sun+soil+edjoin+ingchoice+soil+ycoinvoice+less+lytoil+etroy+alvoy+agepoint+lessloy+al+tyap+point+mentde+stroy+erspoil+eda+voidpoison\begin{align*}&\text{en}+\text{joy}+\text{ment} && \text{join}+\text{ing} && \text{toil}+ \text{et} && \text{ap}+ \text{point}+ \text{ment}\\ &\text{joy}+ \text{ful}+ \text{ly} && \text{choice}+ \text{s} && \text{roy}+ \text{al} && \text{de}+ \text{stroy}+ \text{er}\\ &\text{boil} && \text{oil}+ \text{y} && \text{voy}+ \text{age} && \text{spoil}+ \text{ed}\\ &\text{boy}+ \text{'s} && \text{coin} && \text{point}+ \text{less} && \text{a}+ \text{void}\\ &\text{un}+ \text{soil}+ \text{ed} && \text{voice}+ \text{less}+\text{ly} && \text{loy}+ \text{al}+ \text{ty} && \text{poison}\end{align*}

4. Now sort the twenty words into the matrix, as we have done with enjoyment.

5. How Do You Spell [oi]? When the sound [oi] comes at the very end of an element, it is spelled _______; everywhere else it is spelled _______.

Word Venn. In circle A put only words that contain the sound [ou˙\begin{align*}\dot{\text{u}}\end{align*}]. In circle B put only words that contain the sound [oi]. In circle C put only words that contain the sound [z]:

amountsoutpointedappointmentscowboysvowelsvoicesallowancespecializebicyclistpuresttoiletshouseboycoinsjournalsthousands\begin{align*}&\text{amounts} && \text{voices} && \text{toilets}\\ & \text{outpointed} && \text{allowance} && \text{houseboy}\\ & \text{appointments} && \text{specialize} && \text{coins}\\ & \text{cowboys} && \text{bicyclist} && \text{journals}\\ & \text{vowels} && \text{purest} && \text{thousands}\end{align*}

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