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Which of the expressions, "come to think of it" or "comes to think of it", grammatically correct? Or are they grammatical at all?

If it is a short form of,

When one comes to think of it, I would rather have a cat.

It should be

Comes to think of it, I would rather have a cat.

But it seems that it is more often used as

Come to think of it, I would rather have a cat.

Which one is correct?

Grammatically, it neither seems to be a normal sentence. Are there more expressions with similar structure (verb phrase that is not an imperative).

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3  
If it's short for anything, it's actually "When I come to think of it", not "one". –  St John of the Cross Mar 28 '13 at 14:12
    
@StJohnoftheCross Cool. Is there a situation where "When one comes to think of it" could be truncated, and is valid? –  Memming Mar 28 '13 at 17:00
    
One could certainly use it if one were to speak in an absurdly formal fashion. But you couldn't use "Comes to think of it", because it's a fixed phrase which should be "Come to think..." You would have to use the full "When one..." –  St John of the Cross Mar 28 '13 at 17:26
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1 Answer

up vote 2 down vote accepted

The expression come to think of it actually functions as a phrase

come to think of it

on reflection (said when an idea or point occurs to one while one is speaking): come to think of it, that was very daring of you

and therefore "Come to think of it, I would rather have a cat." is the correct choice of sentence.

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3  
As usual, it's a truncated clause. St.JotC got it in one: When I come to think about it is indeed the fixed clause that becomes a fixed phrase by deletion of the when and the I subject. –  John Lawler Mar 28 '13 at 14:53
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