Difference between AS TO and ABOUT

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Hi,
In which situations cannot we use AS TO and ABOUT interchangeably?
Thanks.

When about is used to mean ‘regarding/ concerning’, it is interchangeable with ‘as to’. In this case, the only difference is that ‘as to’ is more formal:
 

  • He came up with no explanation as to why he stole from his parents.
  • He came up with no explanation about why he stole from his parents.

 

  • They were uncertain as to which house to buy.
  • They were uncertain about which house to buy.

 
However, the word ‘about’ has many other uses where ‘as to’ would not be correct. Here are some examples:
 
on the subject of something/ somebody

  • Tell me about your job. (correct)
  • Tell me about as to your job. (incorrect)

 
to describe the purpose of something

  • Bob’s life is all about making money. (correct)
  • Bob’s life is as to making money. (incorrect)

 
approximately

  • She’s about forty years old. (correct)
  • She’s as to forty years old. (incorrect)

 
in many directions, in various places

  • My children’s toys are all about the house. (correct)
  • My children’s toys are all as to the house. (incorrect)

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