The pattern I see is that you confuse number and gender.
- *Estos libro → It is not written in the plural because it speaks <u>only</u> of a <u>book</u>.
- Esos plato → It is not written in the plural because it <u>only</u> speaks of one <u>dish</u>.
- Aquellos carros → It is not written in the singular and masculine because it speaks <u>many</u> <u>cars</u> (masculine).
- Aquellas casas → It is written in <u>feminine</u> because it talks about some houses (feminine).
<h3><em><u>MissSpanish</u></em></h3>
Answer:
Bebo jugo de naranja. =( I drink an indefinite amount of orange juice.)
Bebo un jugo de naranja. = (I drink a glass / cup / bottle of orange juice.)
The word "un" changes the meaning of a sentence
The answer here would be "Escribeme" meaning "write to me" i hope this helps.