Subject & verb agreement

1) All/Part/Half/Most/Any/Some/A lot/Fraction... of uncountable noun + singular verb

ex) All of her money was spent in clothes

2) All/Part/Half/Most/Any/Some/A lot/Fraction... of plural countable noun + plural verbex) All of the toyswere broken Hi. I'm studying English grammar and the rules above are about subject and verb agreementI was wondering if the following expressions are possible (1) Some of the apple is rotten(2) Two thirds of the apple is rotten After the preposition 'of', is it possible to use an singular countable noun like the two examples above?I have read many grammar books, but most books said that uncountable and plural countable nouns are only possible Thanks for reading my question and answer this question please