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When you form the Negative and the Interrogative of a Past Tense verb, you use the auxiliary TO DO in the Past Tense = DID + the Short Infinitive of the respective verb (the Infinitive minus TO). The information that we are dealing with a Past Tense is included in the auxiliary verb, so we don't need to use the Past Tense of the main verb, too. Therefore, you should say "didn't see", not "didn't saw".

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15y ago

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