The expression is You can't have your cake and eat it too. Too and also mean "in addition", so there has to be a something #1 and a something #2. Without 2 different "somethings" in sight, it is like a dangling "and"...
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northwindYou can't have your cake too.I will try another time, and add to CJ's great examples.
You can't have your cake also.
You can't have your cake either.
GoodmanIf I am not mistaken, regardless of the "too" and "either" logic, the correct idiomatic expression is "you can't have the cake and eat it too", instead of "your" cake?.Goodman: