which sentences are correct

[praveen241]

dear forum members

I am very confused that which sentences are correct.please help me

(1)- The sky is getting red.
(2)- The sky is getting redder.
(3)- The sky is getting redder and redder.

(4)- This book is most useful of all.
(5)- This is the most useful book of all.
(6)- This is the most useful of all books.

(7)- Rita is the best of all women.
(8)- Rita is the best women of all.

THANKS.

[Tdol]

4- should have 'the' - if you just say 'most useful' (meaning very useful) then you can omit the article.
8- woman