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Anonymous Posted 16 years ago
Grammar

As you know/have known

(As you know / As you have known), this is not a new problem.

Are they all correct, if so, could you tell me about their difference?

Thanks.
  

Top answer

Hi, The focus is on what 'you' know at present, so only 'as you know' is natural. Another way to consider it is this. Only in the present can you really know that something is not a new problem.

— Clive

  • Hi, The focus is on what 'you' know at present, so only 'as you know' is natural.
  • Another way to consider it is this.
  • Only in the present can you really know that something is not a new problem.
  • Clive
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2 Answers
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Hi,



The focus is on what 'you' know at present, so only 'as you know' is natural.



Another way to consider it is this.

Only in the present can you really know that something is not a new problem.



Clive
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Well both the sentences are correct. But as CL pointed, the first is more common and frequent.

Regards!
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