The verb "IR"

What does the preposition a mean in these two sentences?

• to

• from

We use al when the place someone is going to is...

• masculine

• feminine

Which form of the verb IR would you use to say We go on vacation/ holiday

• Vamos de vacaciones.

• Va de vacaciones.

• Voy de vacaciones.

How do you say, we are going to school?

• Vamos al colegio.

• Van al colegio.

• Voy al colegio.

If you are asking where someone is going to, do you use ¿dónde? or ¿adónde?

• ¿dónde?

• ¿adónde?

Which of the following means to go on holiday/go on vacation?

• ir de vacaciones

• ir a casa

• ir de compras