Spanish language Q&A Forum

I see quite some time has been devoted to this subject.  The first time I read the hairdresser example, the English struck me as quite wrong.  I would add my two cents as follows: 

If I went to the hairdresser, I'd spend a lot of money or If I went (had gone) to the hairdresser, I would have spent a lot of money.

Those seem to me to be the simplest way to correct it because one can't correctly say I would spent.    

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In  the phrase

Why is this written like this: Esta noche especial voy a ir a un cotillón

The english said: I am going to a party, NOT I am going to go to a party

Should it be : Voy a un cotillón

Hola))

What is a Spanish equivalent for needn't have (done)? 

It seems to me that when conditional is used que takes on a similar function as si.

Could we replace que with si?

E.g.

No estaría bien que tuvieses tanto tiempo libre.

No estaría bien si tengas/tuvieras tanto tiempo libre.

Hola,

Could you shed some light on why that is used here, please?

Es fantástico que ellos estén a salvo.

Gracias,

In the question "En el viaje ________ un niño atrás", the answer was 'se nos quedó'. Could you give a literal translation of this sentence because otherwise it seems like the verb agrees with the object of the sentence rather than the subject. I guess I'm asking for a way of translating quedar in my head so that even if it makes the English awkward, I can also keep straight subject and object (much like I can substitute "is pleasing" for gustar). 

Thanks! 

It has some, but I would appreciate having all the verbs played, thanks.