If you add ing or ish the y does not change. If there is a vowel before the y , the y does not change.
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They cooked breakfast in a frying pan.
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Lots of turkeys are eaten at Christmas.
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Many river valleys were flooded in the storm.
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He was still boyish despite his age.
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His skin had a greyish tinge which worried the doctor.
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He enjoys running.
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