Vincent Teo CAn I say, (a) He is having a pizza for dinner. (b) He ate a piece / a slice of pizza as his dinner. (c) He had pizza before dinner.
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Vincent TeoCAn I say,Assuming that you mean in (a) that he ate the entire pizza, all three are correct. (c) could also be said with 'some pizza' or 'a pizza', which sound a bit more natural to me.
(a) He is having a pizza for dinner.
(b) He ate a piece / a slice of pizza as his dinner.
(c) He had pizza before dinner.