Spanish language Q&A Forum

When I tried to take the quiz, the questions were posed in English.  Consequently I got zero  However, when I looked at the details correct/incorrect responses, these were presented in Spanish.

Ellas suelen ir al cine los viernes

Usually we use Ellas van, how about this Ellas suelen ir? May I know what is this ir in this case. 

I have answered two questions which I was marked incorrect.

Hor acio

Necesito el coche hasta el sábado

Tengo que terminar los informes hasta las cinco

The translation is not provided, the examples translate it as "must," but google translate shows "owe" and "have to."

Am I right in thinking that this form of relative cannot be used at all after a preposition?

Is it too simplistic to say that:

Sentir is followed by a Noun or que, and

Sentirse is followed by an Adjective/Adverb or como.

Now that I write it out, perhaps it's not easier to remember.

John Nolan 

In the sentence 'David actoweluaba como si lo supiera todo' what is the function of 'lo'?  Is it that 'el' cannot be used after after a word ending in a vowel?

The question asked for the vosotros form, which I'm not even studying, and then the answer was for ustedes.