content_image/746750.jpg content_image/746751.jpg content_image/746752.jpg content_image/746753.jpg
## Negative form 

4 The negative is formed by putting non  before the pronoun: 

<img src='content_image/746750.jpg'>

## Si used with the auxiliary essere 

5 When si  occurs with a verb in the present perfect (or any compound tense), the auxiliary is essere ; the past participle must therefore agree with the subject of the passive verb: 

<img src='content_image/746751.jpg'>

The same applies when si  is not used in a passive function, but purely as an impersonal subject (‘one’, ‘you’, ‘they’, etc.): 

<img src='content_image/746752.jpg'>

## Si used with reflexive verbs 

6 When si  is used with a re fl exive verb, the re fl exive or reciprocal pronoun is ci , not si ; the resulting form is thus ci si : 

<img src='content_image/746753.jpg'>

