The two auxillary verbs used are Avoir and Etre.
Tu as-Tu es
Il/elle a-Il/elle est
Nous avons-Nous sommes
Vous avez-Vous etes
Ils/elles ont-Il/elle sont
After chosing the correct form of the auxillary verb the past participle of the verb must be added.
To form the past participle of an -er verb:
Take off the -er and add -e(acute) Manger-Mange(e is acute)
To form the past participle of an -ir verb:
Take off the -ir and add i Finir-Fini
To form the past participle of an -re verb:
Take off the -re and add u Perdre-Perdu
Irregular Past Participles
Some verbs do not follow the patterns for forming the past participle. They have to be learnt.
Forming the Perfect Tense
Take the correct present tense of the auxillary verb. If you are speaking about yourself you would use Je and for a girl use elle etc. Then the past participle is added to the end.
She lost her sandwich
Elle a perdu sa sandwich.
MRS VANDER TRAMP
Only a limited amount of verbs take etre in the past tense. The acronym MRS VANDER TRAMP is used to remember them.
If a verb takes Etre then extra letters must be added on after the past participle to make the subject agree.
If the subject is feminine add an -e to the past participle- partie
If it is plural add an -s to the past participle- partis
If it is both then add -es to the past participle- parties