SDR1 L5-Direct Objects Pronouns in Spanish Estructura 5.4
Direct Objects receive the verb's action and answer "What? or "Whom?".
Example: Bill hit the ball. The WHAT? The BALL.
Te conozco. (I know you)
La come. (He/She eats it.)
Object pronouns usually are placed before the conjugated verb, but if it is a compound verb (verb phrase), it can be attached to the end of the infinitive or present participle (but it doesn't have to be).
Lo quiero vender / Quiero venderlo - I want to sell it.
Me voy a lavar / Voy a lavarme - I'm going to wash up.
Object Pronouns with Present Participle
When pronouns are used with a present participle or progressive tense, the pronoun(s) can either precede the helping verb or be attached to the participle.
Lo estoy mirando / Estoy mirándolo - I am watching it.
Las estábamos mirando / Estábamos mirándolas - We were looking for them.
Note that when the pronoun is attached to the 2nd verb, an accent must be added to the originally stressed syllable in order to maintain the correct stress on the word.