I took this test and these were the only ones i got wrong, but i want to get the correct answers to study for my final.

15. Where can you place the objeto directo when you have a compound
verb structure with a participio, such as the present perfect
tense?

Re-write the following sentences replacing the underlined direct object with a direct
object pronoun. Remember, the direct object pronoun needs to be placed directly in
front of the conjugated verb.
18. Sara llama a Pedro. (Sara calls Pedro.)

18. Sara la llama a Pedro.

the D.O.P compliments the subject(Sara)
these are the direct object pronouns:
me me
te you(informal)
lo/la he/she
nos we(us)
os you all(informal)
los/las them/you all(formal)

okay thanks. so i can choose anyone??

and how would I write it?

No, you can not choose any one! You need to replace "a Pedro" which is masculine singular. Instead of saying Sara calls Pedro, you are saying "Sara calls HIM." Sara lo llama a Pedro.

Perhaps Chris should have given you the English:
me = me (English)
te = you, informal and singular
lo = him or it
la = her or it
nos = us
os = you-all informal plural
los = them (masculine only or masculine and feminine mixed), you-all (formal and plural)
las = them (feminine only, plural), you-all (only females)

Always place the Direct-Object Pronoun in front of the conjugated verb to play safe. The only time you will be wrong is with an affirmative command. For example: Sara, (comma for direct address, I am speaking to Sara), call Pedro = llámalo (familiar command) or llámelo (formal command)

With gerunds (ending in -ndo) and infinitives you have a CHOICE of position: either in front of the conjugated verb (to play safe) or the option of adding it TO the gerund (with an accent mark) or to the infinitive. Examples: Sara lo está llamando OR Sara está llamándolo. Sara lo va a llamar OR Sara va a llamarlo. Add one thing to an infinitive and there is no accent mark (unless it is on the infinitive anyway, such as oír ) but add anything to a gerund (ndo) and there is a written accent mark.

Feel free to ask any other question, if this is not clear to you.

Sra

To answer question 15, where to place the direct object when using a compound verb structure with a participle like the present perfect tense, you can follow these steps:

1. Identify the main verb and the auxiliary verb in the compound verb structure. In the present perfect tense, the auxiliary verb is "haber" (to have) and the main verb is the past participle of the action verb.
2. Take note of the subject of the sentence and the direct object.
3. Determine if the direct object pronoun is required or appropriate. If it is, select the correct pronoun based on the gender and number of the direct object.
4. Place the direct object pronoun directly before the conjugated form of the auxiliary verb "haber."

Now, let's move on to question 18 where you need to replace the underlined direct object with a direct object pronoun:

To rewrite the sentence "Sara llama a Pedro" (Sara calls Pedro) using a direct object pronoun, you can follow these steps:

1. Identify the direct object in the sentence, which is "a Pedro."
2. Decide on the appropriate direct object pronoun to replace "a Pedro." In this case, the pronoun would be "lo" because "Pedro" is masculine and singular.
3. Place the direct object pronoun directly in front of the conjugated verb "llama," resulting in "Sara lo llama."

By following these steps, you can rewrite the sentence using a direct object pronoun correctly.