Look at these negative sentences:
Je ne suis pas allé au cinéma.I didn't go to the cinema. Je n'ai pas fini.I didn't finish / I haven't finished Elle n'est pas venue hier.She didn't come yesterday.
Notice that in compound tenses where there is an auxiliary verb (être or avoir), the sentence can be negated by placing the second part of the negation (pas) between the auxiliary and the past participle.
See also how ne...pas behaves with simple tenses: Using ne ... pas with simple tenses (negation)
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