Breakdown of Alguien ha abierto la puerta y ha pisado la mancha.
y
and
la puerta
the door
abrir
to open
la
the (feminine)
alguien
someone
haber
(auxiliary) have
la mancha
the stain
pisar
to step on
Questions & Answers about Alguien ha abierto la puerta y ha pisado la mancha.
Why is it abierto instead of abrido?
Abierto is the irregular past participle of abrir (to open). While most verbs ending in -ir form their past participle with -ido, abrir is a common exception that you just have to memorize for the present perfect tense.
Why is the second verb pisado regular when abierto is irregular?
The verb pisar (to step on) is a completely regular -ar verb, so it follows the standard rule: drop the -ar and add -ado to make the past participle pisado. Only a specific group of verbs, like abrir, have irregular past participles.
Why does the sentence use ha for alguien?
Alguien means someone or somebody. Just like in English, it is treated as a third-person singular subject, which is why it takes the singular helping verb ha instead of the plural han.
Do I always have to repeat the helping verb ha after y?
No, you do not have to. Just like in English, you could drop the second helping verb and simply say ha abierto la puerta y pisado la mancha. Repeating ha here just makes the two actions sound like very distinct events.
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