Comparison?

[matf9999]

A. She is three years as old as me.
B. She is three years older than me.
C. She is older than me three years.

Which one do you prefer?

[tom3m]

NOT A TEACHER

B is correct.

[matf9999]

B is correct.

Okay :]
What about these?

A. My new book costs me five times more expensive than yours.
B. My new book costs me five times as much as yours.
C. My new book costs me five times much more expensive than yours.

[tom3m]

NOT A TEACHER


None of your sentences describes what you want to say. This should be correct:

My new book is five times more expensive than yours.

[5jj]

This is possible: My new book cost five times as much as yours.

[matf9999]

None of your sentences describes what you want to say. This should be correct:

My new book is five times more expensive than yours.

Yeah? But

My new book costs me five times as much as yours.

My teacher said this sentence is correct.
Can you check it again?

[5jj]

Yeah? But

My new book costs me five times as much as yours.

My teacher said this sentence is correct.

The present-tense 'costs' alone makes it highly unlikely that we would hear that sentence. To a purist, even if we use a more likely past-tense form, your sentence means 'My new book cost me five times as much as yours (cost me)', which is an unlikely situation. So, although you will hear sentences seuch as your original, few teachers will consider it 'correct'.

Can you check it again?

The word 'please' might be more appropriate than the .

[emsr2d2]

The use of the present tense might be appropriate if you have not already bought the book. Assume that your friend wants to buy a book and the price in your local bookshop is $5. You also want to buy a new book and the price in your local bookshop is $25. You would then be able to say "The new book I want to buy costs five times as much as yours". I would not be very happy with "My new book costs ..." in that context because that makes it sound as if you have already bought the book. Once you have bought the book, it becomes "My new book cost ..."