"a piece of pizza" treats pizza as a substance. (Uncountable) "a piece of a pizza" treats pizza as an object. (Countable) Jacky56Lin Q1:I ate a piece of pizza.
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Jacky56LinQ1:I ate a piece of pizza.All three Q's are correct (as modified above). Q2 is n
Q2:I ate a piece of a pizza.
Q3:I ate a piece of the pizza you boughttome?