1. Two-thirds of the apple is rotten.

Question

2. Two-thirs of the apples are rotten.
(Both are correct,right?0

3. Most of the books were his.
4. Most of the time was spent in reading.
(Are both grammatical? Do we have to use 'in' before 'reading' in Sentence 4?)

5. The rest of the boys were nervous.
6. The rest of the milk was bad.
(Is #6 grammatical and logical?)

Answer 1

All the sentences are correct, yes.

In 4, you can keep "in" or omit it; either way works.

Answer 2

Amin

Answer 3

1. Two-thirds of the apple is rotten.
2. Two-thirs of the apples are rotten.
(Both are correct,right?0

no they ar'nt