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　　ords, such as the passato prossimo (present perfect). Both the verbs essere and avere act as helping verbs in compound tense formations. For example: io sono stato (I was) and ho avuto (I had).

　　Present Perfect with Avere

　　In general, transitive verbs (verbs that carry over an action from the subject to the direct object) are conjugated with avere as in the following example:

　　Il pilota ha pilotato l'aeroplano. (The pilot flew the plane.)

　　When the passato prossimo is constructed with avere, the past participle does not change according to gender or number:

　　Io ho parlato con Giorgio ieri pomeriggio. (I spoke to George yesterday afternoon.)

　　Noi abbiamo comprato molte cose. (We bought many things.)

　　When the past participle of a verb conjugated with avere is preceded by the third person direct object pronouns lo, la, le, or li, the past participle agrees with the preceding direct object pronoun in gender and number. The past participle may agree with the direct object pronouns mi, ti, ci, and vi when these precede the verb, but the agreement is not mandatory.

　　Ho bevuto la birra. (I drank the beer.)

　　L'ho bevuta. (I drank it.)

　　Ho comprato il sale e il pepe. (I bought the salt and pepper.)

　　Li ho comprati. (I bought them.)

　　Ci hanno visto/visti. (They saw us.)

　　In negative sentences, non is placed before the auxiliary verb:

　　Molti non hanno pagato. (Many didn't pay.)

　　No, non ho ordinato una pizza. (No, I didn't order a pizza.)

　　Present Perfect with Essere

　　When essere is used, the past participle always agrees in gender and number with the subject of the verb, so you have four endings to choose from: -o, -a, -i, -e. In many cases, intransitive verbs (those that cannot take a direct object), especially those expressing motion, are conjugated with the auxiliary verb essere. The verb essere is also conjugated with itself as the auxiliary verb.

　　Some of the most common verbs that form compound tenses with essere are listed in the table below:

　　INTRANSITIVE ITALIAN VERBS THAT APPEAR WITH ESSERE IN PRESENT PERFECT

　　andare

　　to go

　　arrivare

　　to arrive

　　cadere

　　to fall

　　dimagrire

　　to diet

　　entrare

　　to enter

　　immigrare

　　to immigrate

　　morire

　　to die

　　partire

　　to depart

　　restare

　　to stay, to remain

　　(ri)tornare

　　to return

　　salpare

　　to weigh anchor, to set sail

　　sfuggire

　　to run away, to flee

　　stare

　　to stay, to be

　　uscire

　　to go out

　　venire

　　to come