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I don't know which of the following expressions is correct for depicting past version of "think":

  1. I didn't think...
  2. I don't thought...
  3. I didn't thought...
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closed as general reference by aedia λ, Kris, Armen Ծիրունյան, Bill Franke, mplungjan Feb 13 '13 at 8:39

This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information.If this question can be reworded to fit the rules in the help center, please edit the question.

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Conjugation of "not think" –  aedia λ Feb 13 '13 at 6:39
    
@aediaλ Thanks, really useful. –  Afshin Mehrabani Feb 13 '13 at 6:41
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Anything with did or did not will keep the infinitive version of the verb –  mplungjan Feb 13 '13 at 8:41
    
@mplungjan Aha, I got it. –  Afshin Mehrabani Feb 13 '13 at 9:49
    
Great, It is the single biggest mistake made by all non-native speakers I have heard. –  mplungjan Feb 13 '13 at 9:51
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1 Answer 1

up vote 1 down vote accepted

'I didn't think...' is right, for present tense, and past tense is "I had not thought...." This is probably better on English language users: http://ell.stackexchange.com/

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1  
didn't think is past tense. don't think or am not thinking is present and present continuous. had not thought is past perfect. –  Jim Feb 13 '13 at 7:17
    
So you also have I wasn't thinking as a correct answer. As usual, the question which is correct depends on the context. And how about I thought not? –  Mr Lister Feb 13 '13 at 7:33
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