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Which one is correct?

  1. Do you know what is the best thing that's ever happened to me?
  2. Do you know what the best thing that's ever happened to me is?

And also, how can I know when the word "is" goes at the end of a sentence or not? Because I've also seen cases where people write «I don't know what love is»

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    Both would be understood to be asking the same thing, but the second one feels more "correct" and natural (aside from the missing "know").
    – nnnnnn
    Commented Jul 6, 2020 at 3:23

1 Answer 1

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Both are grammatical. The normal rules about embedded questions lead to 2.

But because the complement the best thing that's ever happened to me is long, and the verb is is very short, sentences like this can become confusing, especially in writing; so the rule of extraposition allows sentence 1.

However, to my ear, the most natural sentence is

  1. Do you know what the best thing is that's ever happened to me?

which is also allowed by extraposition, and has the advantage that the is can be stressed.

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