what are the positions of adverbs in negative passe compose sentences for example the adverbs which are ending -ement je n'ai pas lentement mangé or je n'ai pas mangé lentement?
Position of French Adverbs - with compound tenses
So your sentence in the affirmative would be J'ai mangé lentement.
Then to create the negative sentence you need to place ne and pas around the auxiliary verb as explained in the following lesson:
Ne ... pas = Not - with compound tenses (French Negations)
So your sentence becomes Je n'ai pas mangé lentement.
I find the following article useful for summarizing this information on placement of French adverbs in compound sentences:
I hope this helps :)
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