Fourfold/fivefold usage

Ilyana

Senior Member
Russian
Hello!

I want to use adjectives "fourfold" or "fivefold" with relative clauses "what they were/what they represented/etc.". I didn't manage to find examples of such usage in the internet. These are sentences that I made up myself. Should I use "of" in these sentences? Or maybe they are wrong with "of" or without "of" all the same?

The number of birds in the park is fivefold what it was 10 years ago.
The number of birds in the park is fivefold of what it was 10 years ago.
 
  • velisarius

    Senior Member
    British English (Sussex)
    We more normally talk of something as "having increased fivefold", or of there having been "a fivefold increase."

    In your sentences it would be more natural to write "The number is five times what it was"
     

    perpend

    Banned
    American English
    I agree with velisarius, but the end of your sentence needs to be adjusted a bit.

    The number of birds in the park has increased fivefold from what it was 10 years ago.
     
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