Spanish language Q&A Forum

Can you wait at the door?

Ustedes pueden .....etc 

Why ustedes, ustedes = they 

I am having some difficulties with this sentence: Los empleados de la tienda se quedaron perplejos.

Why is quedarse used here and not quedar? I went back to the lesson that deals with the differences and therein both are used with an adjective or participle to express the result of an action (=quedar) or change (=quedarse). For quedar + adjective, it is also written that the meaning is rather "to end up", and I feel like it fits well in the sentence above: they ended up perplexed due to what Beru did. 

Could both be correct in this context?

Thanks!

What's the difference between:

Hace ocho semanas que estudié.

y

Hace ocho semanas estudié.

I understand the first sentence from this lesson, but is the second one just incorrect or does it mean something else?

When talking about forgetting things, these two forms are given:

- olvidar [algo]

- olvidarse" [de algo]

But what about forgetting someone?

Are these two forms then still correct?