Spanish language Q&A Forum

In your example and in Spanish grammar is the “a ella” repetition of the indirect object “le” essential or is it an optional extention added for the sake of clarity?

Why isn't vegetales accepted for vegetables?

I saw a sentence "Nos pasamos El día" it means we spent the day, but "Pasamos el día" means the same thing as well. I always get confused what's the reason behind using "NOS" in the first sentence.

I've read the Q&A and related articles and am still confused. The sentence is: My sisters are often late, I always wait for them for two hours. When I apply the information in the lesson's Q&A, I ask myself: "For whom do I wait? For my sisters." Therefore sisters should be an indirect object. However, the quiz gives the direct object pronoun, las, as correct. Which is it and why? (Also, it would be helpful if you edited the questions so the correct answer to this appears consistently.) 

ps: it looks like Marcos and Lisa, below, are asking the same question in slightly different ways. Perhaps you can address all 3 questions as a group. Thanks!

In a question requiring the answer "Sevilla es una de las ciudades más bonitas de España" I put en instead of de and was marked incorrect. However, as the lesson states, this isn't incorrect but simply 'less common'. In fact, isn't it so that a closer translation of the 'de' here might be '...one of the most beautiful Spanish cities' rather than '...cities in Spain'?

How do I know when a noun is masculine or feminine?

Do I go off the last letter of the noun? Like planta and idea end in 'a' so I use una, but if it ends in an 'o' or any other letter besides 'a' then I say un.

I'm confused by the translation of ¡Que me ensucias la camisa! (You will get my shirt dirty). Can the following structures be translated similarly (e.g., you will get my shirt dirty).  

¡Que ensucias la camisa mia! o ¡Que ensucias la camisa de mi!

Gracias por todo.

Pati

I am very confused. In the above lesson it describes when to use poder in the preterite indefinido.

in this lesson there seems to be No specific moment in the past or where speaker is outside the time frame 

This lesson "Conjugate poder in the preterite tense in Spanish (El Pretérito Indefinido)" it describes when to use the preterite indfinido when referring to a specific moment in past  and time it happened is relevent OR referes to pastwhere speakersees themselves outside the time frame