You did not answer the question completely though. So for the phrase "estoy bebiendolos" where is the accent placed? Don't you have to add an accent when the direct object is attached at the end of a progressive tense?

I apologize for any confusion caused. In the phrase "estoy bebiéndolos," the accent is not placed on any specific letter. You are correct that in some cases, an accent may be added in the present progressive tense when the direct object pronoun is attached at the end. However, in this particular case, since "los" is a direct object pronoun representing a masculine plural noun ("them" in English), it does not require an accent.

To answer your question more comprehensively, here's a step-by-step guide you can follow to determine if an accent is needed when attaching a direct object pronoun at the end of a progressive tense verb:

1. Identify the verb conjugation in the present progressive (estar + present participle). In this case, it is the verb "beber" (to drink) conjugated as "estoy bebiendo" (I am drinking).
2. Determine the direct object pronoun that corresponds to the noun in question. In this case, it is "los" (them).
3. Check if the direct object pronoun is a monosyllabic word (one syllable). If it is, then an accent is needed on the stressed vowel of the verb. However, "los" is not monosyllabic, so an accent is not required in this case.

I hope this explanation clarifies your doubt. Please let me know if you have any further questions.