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<img src='content_image/673220.jpg'>

As these examples show, the negative is formed by putting non  before ne . 

## Agreement of the past participle 

When ne  is used with a verb in the present perfect (or any other compound tense), there are certain rules governing the agreement of the past participle. 

5 When ne  is used in a sentence where the quantity is expressed by a number, the past participle must agree in gender with the noun it replaces, and in number (i.e. singular or plural) with the quantity of what ne  stands for. Take this question: 

<img src='content_image/673221.jpg'>

In the answer to this question, the ending of comprato  will depend on the gender  of rivista  (feminine) and on whether you bought one  magazine (singular) or more than  one (plural): 

<img src='content_image/673222.jpg'>

The same applies when ne  replaces a masculine noun: 

<img src='content_image/673223.jpg'>

Here, the ending of fatto  must be masculine, but whether it is singular or plural will depend on how many exercises have been done: 

<img src='content_image/673224.jpg'>

The same rule applies when the quantity is expressed by qualcuno / qualcuna (remember that this is always singular) or alcuni / alcune  (plural): 

<img src='content_image/673225.jpg'>

