San
Lv 5

Which is correct?

This problem is tricky. I would never have been able to solve it without (knowing / having known) other similar problems.

Thanks!

2 Answers

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  • RP
    Lv 7
    1 month ago
    Favorite Answer

    Having known is best, although the other is acceptable. In addition, "other similar" is a redundancy that can be resolved by removing "other." Similar says it all,

    • San
      Lv 5
      1 month agoReport

      Thanks!

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  • 1 month ago

    I would rewrite the sentences. 

    This problem is tricky. If I didn't have similar problems, I wouldn't know how to solve it.   

     

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