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6 When the quantity is expressed by an adverb or an adjective, the past participle agrees with the noun replaced by ne : 

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7 When the quantity is expressed by a noun, the past participle can agree either  with the quantity (this is more usual) or  with the noun replaced by ne : 

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8 When ne  occurs in a sentence together with a verb in the in fi nitive (usually after dovere , potere , volere  or sapere ), it can be attached to the in fi nitive. In such cases, when the main verb is in the present perfect (or any other com- pound tense) the past participle does not agree: 

