Passé composé: avoir or être?
CEFR A1 · part 2
edumaterial's parts within the level. The European framework does not subdivide them.
The partitive: du, de la, desUsing du, de la or des before uncountable things, and switching to de after a negative.à and de with the article: au, aux, du, desContracting à + le into au, à + les into aux, de + le into du and de + les into des…Adjectives: before or after the nounPlacing the adjective correctly and making it agree, including irregular feminine forms.Son, sa, ses: they agree with the thingChoosing the possessive by the gender and number of the thing owned, not the owner; and…C'est or il estUsing c'est to introduce or identify —with an article after— and il/elle est to describe…The three ways of asking a questionAsking the same question three ways and knowing which each situation calls for…The rule, in three lines
The passé composé is auxiliary + participle. Most verbs take avoir, but a closed group takes être, and with être the participle agrees with the subject.
The usual slip. Using avoir for everything, because English has only «have» — and never making the participle agree.
Why it catches you out. English has one auxiliary, «have», so like the Spanish speaker you use avoir for everything. And since English participles never change, you never make yours agree either.